Boiling Heat Transfer: Convection Controlled by Nucleation

Abstract

Due to the peculiar way of evolution of boiling heat transfer research, a model "theater of director" (MTD), pumping effect of growing bubble (PEGB) and MTD-based universal correlation (UC) remain beyond the attention of researchers for more than half a century.In parallel, there are periodic fundamental events, demonstrating the irrationality of such indifference. Since the 1980s, not having found a way to enhance boiling heat transfer, other than that uncovered by the MTD-UC, high-performance boiling surfaces are being developed by artificially increasing effective radius (ER) of nucleation centers (bypassing the reference to the relevant theoretical basis). In 2009, an independent review declares transient conduction and microconvection as the dominant boiling heat transfer mechanism, not knowing that this is just the PEGB. In 2014-2017, the real versatility and accuracy of the UC is confirmed by independent studies, which involve extensive databases on the pool and flow boiling (with some interpretation problems). Assessing the current status of the study, the chapter emphasizes the complete fiasco of traditionally adopted approaches, models and theories, led to the dominance of purely empirical relationships written in a dimensionless form. Heat transfer research community is invited to gain will and rid of the heavy burden of the past.

Determination of Thermal Diffusivity Values Based on the Inverse Problem of Heat Conduction – Numerical Analysis

“…It should be emphasized, however, that the indicated level of convective heat transfer intensity is achieved under steady-state conditions, with the development of convective air movement. For dynamic conditions, convective heat transfer nucleation, the actual value of the heat transfer coefficient will change over time h = h(t) and for short observation times, it will be lower than the indicated values [11]. It is worth pointing out that in the work of [10], the accuracy of determining the value of the thermal diffusion coefficient of 316 L steel was 0.5%.…”