Experimental Study on Transient Boiling Heat Transfer and Critical Heat Flux on Horizontal Vertically-Oriented Ribbon with Different Surfaces under Atmospheric Conditions

Htet, Min Han; Fukuda, Katsuya; Liu, Qiusheng

doi:10.5988/jime.50.782

Cited by 5 publications

(1 citation statement)

References 27 publications

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“…Therefore, the TS-I in this study having very fine surface was prepared to verify the effect of pre-pressurization (or) flooded cavities. As the in T  of TS-I is similar to the result of the TS-II with pre-pressurization up to 4.4 MPa acquired by Htet, et al, (2015), the TS-I has demonstrated to be a characteristic of flooded cavities which is a satisfactory to the two models suggested by Sakurai (2000) and Kottowski (1977). However, the contact angle, θ, is important to nucleation primarily and, on the other hand, cavity angle,  , shapes nucleation surface superheat (Griffith and Wallis,1960).…”

Section: Typical Heat Transfer Processes For Transient Chfsupporting

confidence: 72%

Transient boiling critical heat flux on horizontal vertically oriented ribbon heater with treated surface condition in pool of water

Htet

Fukuda

Liu

2016

Mechanical Engineering Journal

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The deep understanding of transient pool boiling critical heat flux (CHF) phenomena with treated surface and its correlation in water at saturated and subcooled conditions are becoming increasingly important for the database for the further enhancement of the design of liquid cooling technologies. Transient CHF using horizontal cylinders with different surfaces have been reported. However, there is a need to find the effect of surface wettability (contact angle) on transient CHF. This paper aims to study the steady and transient CHF due to exponentially increasing heat inputs,, using horizontal vertically oriented platinum ribbon in a pool of water with respect to pressure, subcooling, surface roughness and contact angle. The exponential period,  , was varied from 5 ms to 10 s. We used three ribbon heaters with different surfaces, namely, commercial surface (CS), treated surface I (TS-I) polished by buff paper together with alumina, and treated surface II (TS-II) finished by emery paper. For the surface condition, surface roughness and contact angle of each ribbon were measured prior to pool boiling experiment. The acquired non-boiling heat transfer, steady and transient CHF were evaluated with existing corresponding equations. The steady-state CHFs measured on the TS-I were tested with the corresponding results of commercial surface. The three groups of transient CHF with different physical mechanisms, the enhancement of transient CHF in light of surface condition and transient CHF degradation depending on pressure and subcooling were reported.

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Section: Typical Heat Transfer Processes For Transient Chfsupporting

confidence: 72%