NUCLEATE BOILING HEAT TRANSFER ENHANCEMENT OF HALOCARBON REFRIGERANTS USING CARBON NANOTUBES
In this study, the effect of carbon nanotubes (CNTs) on nucleate boiling heat transfer is investigated. Two halocarbon refrigerants of R123 and R134a were used as working fluids and 1.0 vol. ％ of CNTs was added to them to examine the heat transfer enhancement with CNTs. The experimental apparatus was composed of a liquid pool and a plain horizontal tube heated by a cartridge heater. All data were obtained at the pool temperature of 7℃ in the heat flux range of 10～80 kW/m2. Test results showed that CNTs increase nucleate boiling heat transfer coefficients for these halocarbon refrigerants. Especially, large enhancement was observed at low heat fluxes of less than 30 kW/m2. With increasing heat flux, however, the enhancement was suppressed due to vigorous bubble generation. Fouling on the heat transfer surface was not observed during the course of this study. Optimum dispersion of CNTs should be examined for their commercial application to enhance nucleate boiling heat transfer in refrigeration and air-conditioning applications.
Seung-Gyoo WOO Ki-Jung PARK Dongsoo JUNG
Graduate student, Inha University, Incheon, 402-751, Korea Department of Mechanical Engineering, Inha University, Incheon, 402-751, Korea
国际会议
The 22nd International Congress of Refrigeration(第22届国际制冷大会)
北京
英文
2007-08-21（万方平台首次上网日期，不代表论文的发表时间）