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http://dx.doi.org/10.3795/KSME-B.2013.37.4.343

Study of Pool Boiling Heat Transfer on Various Surfaces with Variation of Flow Velocity  

Kang, Dong-Gyu (Dept. of Mechanical Engineering, Inha Univ.)
Lee, Yohan (Dept. of Mechanical Engineering, Inha Univ.)
Seo, Hoon (Dept. of Mechanical Engineering, Inha Univ.)
Jung, Dongsoo (Dept. of Mechanical Engineering, Inha Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.37, no.4, 2013 , pp. 343-352 More about this Journal
Abstract
In this study, a smooth flat surface, low fin, Turbo-B, and Thermoexcel-E surfaces are used to examine the effect of the flow velocity on the pool boiling heat transfer coefficients (HTCs) and critical heat fluxes (CHFs). HTCs and CHFs are measured on a smooth square heater of $9.53{\times}9.53mm^2$ at $60^{\circ}C$ in a pool of pure water at various fluid velocities of 0, 0.1, 0.15, and 0.2 m/s. Test results show that for all surfaces, CHFs obtained with flow are higher than those obtained without flow. CHFs of the low fin surface are higher than those of the Turbo-B and Thermoexcel-E surfaces due largely to the increase in surface area and sufficient fin spaces for the easy removal of bubbles. CHFs of the low fin surface show even 5 times higher CHFs as compared to the plain surface. On the other hand, both Turbo-B and Thermoexcel-E surfaces do not show satisfactory results because their pore sizes are too small and water bubbles easily cover them. At low heat fluxes of less than $50kW/m^2$, HTCs increase as the flow velocity increases for all surfaces. In conclusion, a low fin geometry is good for application to steam generators in nuclear power plants.
Keywords
Heat Transfer Coefficients; Critical Heat Flux; Low Fin Surface; Turbo-B Enhanced Surface; Thermoexcel-E Enhanced Surface; Effect of Flow Velocity;
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Times Cited By KSCI : 1  (Citation Analysis)
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