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

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<p>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=Q0 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.</p>

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