scholarly journals RECENT ADVANCES OF SURFACE WETTABILITY EFFECT ON FLOW BOILING HEAT TRANSFER PERFORMANCE

2021 ◽  
Vol 17 ◽  
Author(s):  
Shuang Cao ◽  
Hui Yang ◽  
Luxing Zhao ◽  
Tao Wang ◽  
Jian Xie
Keyword(s):  
Heat Transfer ◽  
Boiling Heat Transfer ◽  
Heat Transfer Performance ◽  
Flow Boiling ◽  
Surface Wettability ◽  
Transfer Performance ◽  
Recent Advances ◽  
Flow Boiling Heat Transfer

Flow Boiling Heat Transfer With Binary and Ternary Mixtures in Microfin Tubes

2000 ◽  
Author(s):  
Norihiro Inoue ◽  
Masao Goto ◽  
Satish G. Kandlikar
Keyword(s):  
Heat Transfer ◽  
Boiling Heat Transfer ◽  
Ternary Mixture ◽  
Heat Transfer Performance ◽  
Flow Boiling ◽  
Ternary Mixtures ◽  
Transfer Performance ◽  
Flow Boiling Heat Transfer ◽  
Binary And Ternary Mixtures ◽  
Microfin Tubes

Abstract An experimental setup was designed and fabricated to test the flow boiling heat transfer performance of microfin tubes. Five microfin tubes were tested with pure refrigerants. Two tubes were selected for further testing with binary and ternary refrigerant mixtures. This paper reports the data for these two microfin tubes employing R22, R410A (mixture of 50% by weight of R32 and 50% of R125) and R407C (ternary mixture of 23 wt. % R32, 25 wt. % R125, and 52 wt. % R134a). A correlation scheme is presented for the heat transfer coefficient of mixtures in microfin tubes. In general, it is observed that the heat transfer performance of binary mixture R410A in microfin tubes is similar to pure R22; however, the performance of the ternary mixture R407C is lower than that with pure R22.

scholarly journals Effect of Surface Biphilicity on FC-72 Flow Boiling in a Rectangular Minichannel

2021 ◽  
Vol 7 ◽  
Author(s):  
Akam Aboubakri ◽  
Vahid Ebrahimpour Ahmadi ◽  
Suleyman Celik ◽  
Abdolali K. Sadaghiani ◽  
Khellil Sefiane ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Flow Regime ◽  
Boiling Heat Transfer ◽  
Heat Transfer Performance ◽  
Flow Boiling ◽  
Bubbly Flow ◽  
Hydrophobic Surface ◽  
Heat Fluxes ◽  
Transfer Performance ◽  
Transfer Coefficients

Flow boiling is one of the most effective mechanisms in heat transfer thanks to the latent heat of vaporization. Surface modifications such as mixed-wettability have a considerable effect on the boiling heat transfer performance in terms of enhancement in boiling heat transfer as well as critical heat flux. This study introduces a new method of fabrication of biphilic surfaces, where C4F8 (Octafluorocyclobutane) islands are surrounded by silicon. Two different biphilic surfaces were fabricated and compared with the entirely uniform hydrophobic surface taken as a reference,. Each of the biphilic surfaces has three different sections, namely inlet, middle and outlet regions. The first region is mainly hydrophobic (inlet), while the third region is mainly hydrophilic (outlet). The heat transfer coefficients were obtained at different heat fluxes. Compared to the entirely uniform hydrophobic surface, the results show that biphilic surfaces enhance the boiling heat transfer performance by up to 50%. The visualization results revealed that the biphilic surfaces lead to more nucleation sites in the bubbly flow regime and break up the elongated bubbles in the slug flow regime.

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