Effects of surface functionalization on the flow boiling heat transfer characteristics of MWCNT/R141b nanorefrigerants in smooth tube
作者： Bin Sun , Hailong Wang , Di Yang
DOI: 10.1016/J.EXPTHERMFLUSCI.2017.11.018
关键词: Carbon nanotube 、 Mass flow rate 、 Refrigerant 、 Surface modification 、 Volume fraction 、 Vapor quality 、 Chemical engineering 、 Heat transfer 、 Materials science 、 Heat transfer coefficient
摘要: Abstract This paper presents an experimental method to study the flow boiling heat transfer characteristics of two functionalized multi-walled carbon nanotube nanorefrigerants (MWCNT-COOH/R141b and MWCNT-OH/R141b). The conditions are as follows: nanoparticles volume fraction individually set at 0.059%, 0.117% 0.176%; mass rate ranges from 100 350 kg·m −2 ·s −1 ; inlet vapor quality 0.2 0.7. Results showed that both MWCNT/R141b can enhance coefficient a refrigerant in tube, enhancement was increased with increase fraction. MWCNT-COOH/R141b were better than MWCNT-OH/R141b nanorefrigerants. At condition G = 120 kg·m 0.176%, nanorefrigerant up 23.4% 15.18%, respectively.
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