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Enhancement of Pool Boiling Heat Transfer Coefficients with the Use of Carbon Nanotubes  

Park Ki-Jung (Graduate School of Mechanical Engineering, Inha University)
Jung Dong-Soo (Department of Mechanical Engineering, Inha University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.18, no.10, 2006 , pp. 842-849 More about this Journal
Abstract
In this study, the effect of carbon nanotubes (CNTs) on boiling heat transfer is investigated. Three refrigerants of R22, R123, R134a, and water are used as base working fluids and 1% of CNTs by volume is added to the base fluids to study the effect of CNTs. All data are obtained at the pool temperature of $7^{\circ}C$ for all refrigerants and $100^{\circ}C$ for water in the heat flux range of $10{\sim}80\;kW/m^2$. Test results show that CNTs increase the boiling heat transfer coefficients for all fluids. Especially, large enhancement was observed at low heat flutes. With increasing heat flux, however, the enhancement was suppressed due to vigorous bubble generations. Fouling was not observed during the course of this study. Optimum quantity and type of CNTs and their dispersion should be examined for their application in pool boiling heat transfer.
Keywords
Pool boiling heat transfer; Heat transfer coefficients; Carbon nanotubes(CNTs);
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