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学者姓名：魏进家
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Abstract ：
The uniform electric field is an effective method to improve boiling heat transfer performances, especially via breaking the mushroom bubbles and preventing dry-out; microstructured surfaces remarkably enhance both heat transfer coefficients and critical heat flux in boiling process. In the present study, the coupling effect of a uniform electric field and the microstructured surfaces on pool boiling in FC-72 at the liquid subcoolings ( xe002;T sub ) of 5 K, 15 K, 25 K, and 35 K was studied. Four kinds of the microstructured surfaces with different sizes of micro-pin-fins were fabricated and tested, and compared with a reference smooth surface. It was found that the critical heat flux (CHF) enhancement of the smooth surface due to the electric field ranges from 15.2% to 22.5% and increases with liquid subcooling. For the microstructured surfaces, the effects of electric field on CHF are closely related to the liquid subcooling and size of micro-pin-fins. For the surfaces with fin width of 30 mu m, the increase of CHF due to the electric field is not sensitive to the liquid subcooling; rather, for the surfaces with fin width of 50 mu m, the electric field CHF enhancement decreases with the liquid subcooling. The enhancement of CHF due to the electric field can be explained by the competition of a reduction of the Taylor length and the break of the vapor layer (beneficial to the CHF enhancement) and the field trap effect (not conducive to CHF improvement). The field trap effect on the surface with fin width of 50 mu m becomes very strong at xe002;T sub = 25 and 35 K; as a result, under these two conditions the CHF is reduced under the action of the electric field. (c) 2021 Published by Elsevier Ltd.
Keyword ：
Critical heat flux Electric field Heat transfer Microstructures Pool boiling Subcooling
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| GB/T 7714 | Liu, Bin , Garivalis, Alekos Ioannis , Cao, Zhizhu et al. Effects of electric field on pool boiling heat transfer over microstructured surfaces under different liquid subcoolings [J]. | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2022 , 183 . |
| MLA | Liu, Bin et al. "Effects of electric field on pool boiling heat transfer over microstructured surfaces under different liquid subcoolings" . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 183 (2022) . |
| APA | Liu, Bin , Garivalis, Alekos Ioannis , Cao, Zhizhu , Zhang, Yonghai , Wei, Jinjia , Di Marco, Paolo . Effects of electric field on pool boiling heat transfer over microstructured surfaces under different liquid subcoolings . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2022 , 183 . |
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Abstract ：
In this paper, molecular dynamics (MD) simulations are conducted to investigate the bubble nucleation process of liquid argon on surfaces with a nanostructure of different wettabilities. To account for the combined effects of the nanostructure and surface wettability on bubble nucleation, the variation of the bubble volume, the nucleation starting time, as well as the heat flux between the solid surface and fluid are examined. It is found that the position of bubble nucleation depends on the pillar wettability. Bubble nucleation occurs in the bulk of fluid when the pillar is hydrophilic, while it occurs on the pillar surface when the pillar is hydrophobic. Under an integrated influence of the free-energy barrier of nucleation and heat transfer, the nucleation occurs later as the wettability of the pillar gets weaker over surfaces with the hydrophilic pillar, while it occurs earlier as the wettability of the pillar gets weaker over surfaces with the hydrophobic pillar. Moreover, the peak heat flux decreases with the decrease of the pillar wettability over surfaces with the hydrophilic pillar, while it increases with the decrease of the pillar wettability over surfaces with the hydrophobic pillar, which can be explained from the perspective of the heat transfer efficiency and the timing of phase change occurrence. Finally, a new surface with mixed-wettable pillars is proposed, which is verified to be conducive to both bubble nucleation and heat transfer.
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| GB/T 7714 | Zhou, Wenjing , Zhang, Yonghai , Wei, Jinjia . Molecular Dynamics Study on the Combined Effects of the Nanostructure and Wettability of Solid Surfaces on Bubble Nucleation [J]. | LANGMUIR , 2022 , 38 (3) : 1223-1230 . |
| MLA | Zhou, Wenjing et al. "Molecular Dynamics Study on the Combined Effects of the Nanostructure and Wettability of Solid Surfaces on Bubble Nucleation" . | LANGMUIR 38 . 3 (2022) : 1223-1230 . |
| APA | Zhou, Wenjing , Zhang, Yonghai , Wei, Jinjia . Molecular Dynamics Study on the Combined Effects of the Nanostructure and Wettability of Solid Surfaces on Bubble Nucleation . | LANGMUIR , 2022 , 38 (3) , 1223-1230 . |
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Abstract ：
Chemical looping reforming of methane is a novel and effective approach to convert methane to syngas, in which oxygen transfer is achieved by a redox material. Although lots of efforts have been made to develop high-performance redox materials, a few studies have focused on the redox kinetics. In this work, the kinetics of SrFeO3-delta-CaO center dot MnO nanocomposite reduction by methane was investigated both on a thermo-gravimetric analyzer and in a packed-bed microreactor. During the methane reduction, combustion occurs before the partial oxidation and there exists a transition between them. The weight loss due to combustion increases, but the transition region becomes less inconspicuous as the reduction temperature increased. The weight loss associated with the partial oxidation is much larger than that with combustion. The rate of weight loss related to the partial oxidation is well fitted by the Avrami-Erofeyev equation with n = 3 (A3 model) with an activation energy of 59.8 kJ.mol(-1). The rate law for the partial oxidation includes a solid conversion term whose expression is given by the A3 model and a methane pressure-dependent term represented by a power law. The partial oxidation is half order with respect to methane pressure. The proposed rate law could well predict the reduction kinetics; thus, it may be used to design and/or analyze a chemical looping reforming reactor.
Keyword ：
Avrami-Erofeyev model chemical looping reforming pressure-dependent term reduction kinetics SrFeO3-delta/CaO center dot MnO nanocomposite
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| GB/T 7714 | Wang, Xinhe , Yang, Liuqing , Ji, Xiaolin et al. Reduction kinetics of SrFeO3-delta/CaO center dot MnO nanocomposite as effective oxygen carrier for chemical looping partial oxidation of methane [J]. | FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING , 2022 , 16 (12) : 1726-1734 . |
| MLA | Wang, Xinhe et al. "Reduction kinetics of SrFeO3-delta/CaO center dot MnO nanocomposite as effective oxygen carrier for chemical looping partial oxidation of methane" . | FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING 16 . 12 (2022) : 1726-1734 . |
| APA | Wang, Xinhe , Yang, Liuqing , Ji, Xiaolin , Gao, Yunfei , Li, Fanxing , Zhang, Junshe et al. Reduction kinetics of SrFeO3-delta/CaO center dot MnO nanocomposite as effective oxygen carrier for chemical looping partial oxidation of methane . | FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING , 2022 , 16 (12) , 1726-1734 . |
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Abstract ：
Flat heat pipes can effectively spread a concentrated high power heat source in a small region into a larger heat dissipation area, which is widely used in the thermal management of electronic devices. In this paper, two different sintered copper powder wick structures are designed to study the effect of porous column height on the heat transfer performance. The results show that the best performance is achieved at the 30% filling ratio under the 15 degrees C cooling water with all the porous columns contacting with the condenser. The heat power is 312.7 W and the thermal resistance is 0.192 degrees C/W. As the cooling water temperature increases, the evaporation rate increases, resulting in a decrease in the thermal resistance. But the decrease in temperature difference causes the decline in heat dissipation power. Through the visual observation, it is found that the porous column contacting with the condenser can not only play the role of support and liquid reflow pathway, but also serve as an effective evaporation area to improve the heat transfer performance. While the low porous column cannot transport the condensed liquid and is completely immersed by the liquid under the high filling ratio, which is difficult to promote evaporation rate. In order to improve the performance at air cooling situation, an integrated heat pipe combined the flat heat pipe and fin tubes is designed, which can achieve a heat power of 259.8 W and present excellent temperature uniformity. This research provides the guidelines to optimize the heat transfer performance of porous column wick structures.
Keyword ：
Filling ratio Flat heat pipe Integrated Porous column Visualization
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| GB/T 7714 | Zhou, Jie , Liu, Lei , Yang, Xiaoping et al. Visualization research on influencing factors of flat heat pipes [J]. | APPLIED THERMAL ENGINEERING , 2022 , 207 . |
| MLA | Zhou, Jie et al. "Visualization research on influencing factors of flat heat pipes" . | APPLIED THERMAL ENGINEERING 207 (2022) . |
| APA | Zhou, Jie , Liu, Lei , Yang, Xiaoping , Zhang, Yonghai , Wei, Jinjia . Visualization research on influencing factors of flat heat pipes . | APPLIED THERMAL ENGINEERING , 2022 , 207 . |
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Abstract ：
To remove the heat leakage in the compensation chamber (CC) and increase the maximum heat flux of the loop heat pipe, a novel loop heat pipe with a vapor-driven jet injector and a boiling pool (LHPIB) was proposed. The injector driven by the vapor from an evaporator was designed to remove the heat leakage and provide liquid for the boiling pool. The boiling pool was the main heat dissipation component where high heat flux was achieved. Comprehensive experimental research was conducted to evaluate the heat transfer performance of the LHPIB, and visualization study was carried out to reveal its operation mechanism. The results indicated that a timely liquid supply from the injector to the boiling pool was essential for a smooth startup. The LHPIB worked well under variable operating conditions and a new steady state was established quickly when the heat load changed. Maintaining the evaporator heat load at about 238 W, the maximum boiling pool heat load reached 507 W, with the corresponding heat flux up to 105 W.cm(-2), which was higher than most of the conventional loop heat pipes. In general, the LHPIB is a promising candidate for heat dissipation of high heat flux and multi-heat sources. (c) 2021 Elsevier Ltd. All rights reserved.
Keyword ：
Heat leakage High heat flux Loop heat pipe Pool boiling Vapor-driven jet injector
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| GB/T 7714 | Liu, Lei , Yuan, Bo , Yang, Xiaoping et al. Experimental study of a novel loop heat pipe with a vapor-driven jet injector and a boiling pool [J]. | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2022 , 184 . |
| MLA | Liu, Lei et al. "Experimental study of a novel loop heat pipe with a vapor-driven jet injector and a boiling pool" . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 184 (2022) . |
| APA | Liu, Lei , Yuan, Bo , Yang, Xiaoping , Cui, Chenyi , Wei, Jinjia . Experimental study of a novel loop heat pipe with a vapor-driven jet injector and a boiling pool . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2022 , 184 . |
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Abstract ：
The geometrical dimensions of the rough structures as well as the non-condensable gases in the vapor mixture can have the great effect on the nucleation position and the wetting state of the droplet, which further influence the condensation heat flux. In this paper, the multispecies multiphase lattice Boltzmann method together with a thermal phase change model is used to investigate the dropwise condensation on a rough surface enhanced with pillars. The effect of the geometric dimensions including pillar height H, pillar width W and pillar space S is investigated. Then the effect of non-condensable gases on the contact angle of a droplet on textured surface is studied. The results show that the local heat flux and the wetting area are higher while the waiting time is shorter at larger S, W and smaller H on the rough surface. The nucleation position rises from the bottom of grooves to the top with the increase of pillar height and the decrease of pillar space. The contact angle is larger and it is easier to maintain the Cassie state for droplet. When there exists non-condensable gas, the non-condensable gas obviously enhances the hydrophobicity of the rough surfaces compared with pure vapor.
Keyword ：
condensation lattice Boltzmann method numerical simulation wetting state
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| GB/T 7714 | Li Mingjie , Zhou Wenjing , Wei Jinjia et al. Numerical Investigation on Dropwise Condensation on Rough Structures with and without Non-Condensable Gas [J]. | JOURNAL OF THERMAL SCIENCE , 2022 , 31 (2) : 308-317 . |
| MLA | Li Mingjie et al. "Numerical Investigation on Dropwise Condensation on Rough Structures with and without Non-Condensable Gas" . | JOURNAL OF THERMAL SCIENCE 31 . 2 (2022) : 308-317 . |
| APA | Li Mingjie , Zhou Wenjing , Wei Jinjia , Tao Wenquan . Numerical Investigation on Dropwise Condensation on Rough Structures with and without Non-Condensable Gas . | JOURNAL OF THERMAL SCIENCE , 2022 , 31 (2) , 308-317 . |
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Abstract ：
Self-cleaning porous membrane can serve as condensing surface for its capacity of transporting condensate to the back through the pores thus keeping the surface clean during the whole condensing period. However, the three-dimensional (3D) condensate behaviors including the initial nucleation, growth and permeation in the porous structures have seldom been clarified comprehensively. In this work, the 3D pseudopotential LB model with a phase change model are employed, and the condensation process inside the porous membrane with various porosity, wettability, additional external force and section geometric configurations are investigated. It's found that with the increase of porosity, surface hydrophobicity and additional external force, more rapid penetration of condensate in the porous media and correspondingly faster removal rate of liquid can be obtained, and the subsequent vapor condensation is enhanced. But the nucleation time gets longer with high porosity and surface hydrophobicity. The additional external force has little effect on the nucleation time. Larger porosity and lower flow resistance inside the straight channel lead to higher condensation rate at the initial stage of condensation, while the porous structure with distorted pores with the same porosity contributes to improve the total condensation amount. This work helps to select the porous membranes with different porosity, wettability or pore scale geometric characteristic and external field for different condensation conditions in specific applications.
Keyword ：
Condensate behaviors Condensation Lattice Boltzmann method Phase change Porous membrane
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| GB/T 7714 | Li, Mingjie , Cheng, Xiangqiang , Wei, Jinjia et al. Lattice Boltzmann simulation of condensation on self-cleaning porous membrane [J]. | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER , 2022 , 141 . |
| MLA | Li, Mingjie et al. "Lattice Boltzmann simulation of condensation on self-cleaning porous membrane" . | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER 141 (2022) . |
| APA | Li, Mingjie , Cheng, Xiangqiang , Wei, Jinjia , Tao, Wenquan . Lattice Boltzmann simulation of condensation on self-cleaning porous membrane . | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER , 2022 , 141 . |
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Abstract ：
In this study, ZnO nanorods were synthesized on micro-pin-fins by a simple and inexpensive aqueous solution method for flow boiling heat transfer enhancement. The morphology, chemical composition and wickability of the micro/nano hierarchical surface (PF + NR) were characterized. The heat transfer performance of PF + NR was investigated under various flow velocities together with a micro-pin-finned surface (PF), a ZnO nanorod-coated surface (NR) and a smooth surface (S). The results indicated that the boiling performance is improved significantly by the hierarchical surface and demonstrated a synergism between the microstructure and the nanostructure. The maximum boiling heat transfer coefficient of PF + NR is increased by 63%, 76%, and 158% compared with PF, NR and S, respectively. The critical heat flux is also increased by 31%, 33%, and 74%, respectively. The onset of nucleate boiling temperature of PF + NR is decreased compared with that of the other surfaces. The comprehensive improvement of boiling heat transfer performance is attributed to the cooperation of structures in different scales: the nanorods provide abundant nucleation sites, and the micro-pin-fins improve the liquid replenishment capacity and suppress the lateral coalescence of large bubbles at high heat fluxes.(c) 2022 Published by Elsevier Ltd.
Keyword ：
flow boiling heat transfer enhancement hierarchical surface micro-pin-fin Nanorod
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| GB/T 7714 | Liu, Lei , Yu, Lingmin , Yuan, Bo et al. Flow boiling heat transfer enhancement via micro-pin-fins/ZnO nanorods hierarchical surface [J]. | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2022 , 203 . |
| MLA | Liu, Lei et al. "Flow boiling heat transfer enhancement via micro-pin-fins/ZnO nanorods hierarchical surface" . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 203 (2022) . |
| APA | Liu, Lei , Yu, Lingmin , Yuan, Bo , Liu, Bin , Wei, Jinjia . Flow boiling heat transfer enhancement via micro-pin-fins/ZnO nanorods hierarchical surface . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2022 , 203 . |
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Abstract ：
The influence of backward-facing step and forward-facing step on flow boiling heat transfer performance was experimentally studied. The experiments were carried out with expansion ratio of 2, 2.5 and 3, and channel Reynolds number of 3048 to 6097. The heated surface was immobilized at the downstream next to the step. FC-72 was used as the working fluid with the inlet subcooling of 35 K. The bubble behaviors were analyzed by the high-speed camera. The results reveal that the backward-facing step geometry has a negative effect on the heat transfer performance compared with the flat channel. The effect of forward-facing step geometry is related with the dimension of the recirculation regions: the heat transfer performance is enhanced if the reattachment point falls on the heated surface, and is deteriorated if the recirculation region is larger than the length of the heated surface. The bubble behaviors were analyzed to illustrate the dimension of the recirculation region and the mechanism of flow boiling heat transfer over a step. © 2020
Keyword ：
Facings Heat transfer performance High speed cameras Reynolds number Supersonic flow
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| GB/T 7714 | Yuan, Bo , Zhang, Yonghai , Liu, Lei et al. Flow boiling heat transfer and associated bubble behaviors over backward- and forward-facing steps [J]. | Experimental Thermal and Fluid Science , 2021 , 122 . |
| MLA | Yuan, Bo et al. "Flow boiling heat transfer and associated bubble behaviors over backward- and forward-facing steps" . | Experimental Thermal and Fluid Science 122 (2021) . |
| APA | Yuan, Bo , Zhang, Yonghai , Liu, Lei , Wei, Jinjia . Flow boiling heat transfer and associated bubble behaviors over backward- and forward-facing steps . | Experimental Thermal and Fluid Science , 2021 , 122 . |
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Abstract ：
The stability/instability behavior of polystyrene (PS) films with tunable thickness ranging from higher as-cast to lower residual made on Si substrates with and without native oxide layer was studied in this paper. For further extraction of residual PS thin film (h(resi)) and to investigate the polymer-substrate interaction, Guiselin's method was used by decomposing the polymer thin films in different solvents. The solvents for removing loosely adsorbed chains and extracting the strongly adsorbed irreversible chains were selected based on their relative desorption energy difference with polymer. The PS thin films rinsed in chloroform with higher polarity than that of toluene showed a higher decrease in the residual film thickness but exhibited earlier growth of holes and dewetting in the film. The un-annealed samples with a higher oxide film thickness showed a higher decrease in the PS residual film thickness. The effective viscosity of PS thin films spin-coated on H-Si substrates increased because of more resistance to flow dynamics due to the stronger polymer-substrate interaction as compared to that of Si-SiOx substrates. By decreasing the film thickness, the overall effective mobility of the film increased and led to the decrease in the effective viscosity, with matching results of the film morphology from atomic force microscopy (AFM). The polymer film maintained low viscosity until a certain period of time, whereupon further annealing occurred, and the formation of holes in the film grew, which ultimately dewetted the film. The residual film decrement, growth of holes in the film, and dewetting of the polymer-confined thin film showed dependence on the effective viscosity, the strength of solvent used, and various involved interactions on the surface of substrates.
Keyword ：
dewetting polymer thin film solvent rinsing viscosity
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| GB/T 7714 | Rahman, Mujib Ur , Xi, Yonghao , Li, Haipeng et al. Dynamics and Structure Formation of Confined Polymer Thin Films Supported on Solid Substrates [J]. | POLYMERS , 2021 , 13 (10) . |
| MLA | Rahman, Mujib Ur et al. "Dynamics and Structure Formation of Confined Polymer Thin Films Supported on Solid Substrates" . | POLYMERS 13 . 10 (2021) . |
| APA | Rahman, Mujib Ur , Xi, Yonghao , Li, Haipeng , Chen, Fei , Liu, Dongjie , Wei, Jinjia . Dynamics and Structure Formation of Confined Polymer Thin Films Supported on Solid Substrates . | POLYMERS , 2021 , 13 (10) . |
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