Article ID Journal Published Year Pages File Type
7051818 Experimental Thermal and Fluid Science 2018 12 Pages PDF
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 experimental conditions are as follows: the nanoparticles volume fraction are individually set at 0.059%, 0.117% and 0.176%; the mass flow rate ranges from 100 to 350 kg·m−2·s−1; the inlet vapor quality ranges from 0.2 to 0.7. Results showed that both functionalized MWCNT/R141b nanorefrigerants can enhance the flow boiling heat transfer coefficient of a refrigerant in a tube, and the enhancement was increased with an increase in volume fraction. The heat transfer characteristics of the MWCNT-COOH/R141b nanorefrigerants were better than MWCNT-OH/R141b nanorefrigerants. At the condition of G = 120 kg·m−2·s−1 and a volume fraction 0.176%, the heat transfer coefficient of the MWCNT-COOH/R141b nanorefrigerant and MWCNT-OH/R141b nanorefrigerant increased up to 23.4% and 15.18%, respectively.
Related Topics
Physical Sciences and Engineering Chemical Engineering Fluid Flow and Transfer Processes
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