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Experimental Study on Transient Boiling Heat Transfer and Critical Heat Flux on Horizontal Vertically-Oriented Ribbon with Different Surfaces under Atmospheric Conditions
http://hdl.handle.net/20.500.12678/0000007092
http://hdl.handle.net/20.500.12678/000000709280d6ceef-000a-4b0d-ab9f-e33cf35ee023
decb2daf-7cb4-49fe-8a45-291e0551ec6a
Name / File | License | Actions |
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Publication type | ||||||
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Journal article | ||||||
Upload type | ||||||
Publication | ||||||
Title | ||||||
Title | Experimental Study on Transient Boiling Heat Transfer and Critical Heat Flux on Horizontal Vertically-Oriented Ribbon with Different Surfaces under Atmospheric Conditions | |||||
Language | en | |||||
Publication date | 2015-05-09 | |||||
Authors | ||||||
Min Han Htet | ||||||
Description | ||||||
A deep understanding of transient pool boiling heat transfer and critical heat flux (CHF) phenomena in water is important as a fundamental knowledge for the innovative design of liquid cooling technologies. Transient CHF due to exponentially increasing heat inputs, Q =Q 0 exp(t/τ ) , to platinum ribbon in pool of water was measured for saturated conditions at atmospheric pressure. The exponential period,τ , was varied from 5 ms to 20 s. The platinum ribbons having different surface conditions, namely, commercial surface (CS), treated surface-I (TS-I) and treated surface-II (TS-II) were utilized as test heaters. For surface conditions, the values of contact angle and surface roughness were measured prior to pool boiling experiments. The TS-II was subjected to conditions without pre-pressurization and with pre-pressurization up to 4.4 MPa before each experimental run was carried out. It is assumed that the contact angle is a major contributor to increasing CHF at quasi-steadily heat input. The TS-II enhanced the heat transfer performance ~ 290 % and ~ 430 %, and CHF of 1.2 times and 1.5 times relative to CS and TS-I, respectively. It was shown that transition of heat transfer processes and transient CHF depend on surface conditions, heat generation period and pre-pressurization. The transient CHF due to surface conditions was compared with corresponding values. |
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Keywords | ||||||
critical heat flux, transient pool boiling heat transfer | ||||||
Identifier | https://doi.org/10.5988/jime.50.782 | |||||
Journal articles | ||||||
Japan Institute of Marine Engineering | ||||||
Journal of JIME | ||||||
77-88 | ||||||
Vol.50, No.6 (2015) |