Abstract
The proper identification of the existence of the boiling phenomena in a process from the trend of the Nukiyama pool-boiling curve (Q versus ∆T) is not appropriate as it does not always reveal right information. All the heating and cooling around the boiling point mimic the boiling behavior; however, these are not always actually a part of the boiling process. Therefore, the proper identification and discrimination among boiling methodologies need to be revealed as the information on the discussed issues are not available in the open literature. Hence, an attempt has been made to develop a condition describing the existence of boiling behavior in heating or quenching process and protocol to identify various boiling regimes. In the current work, the developed conditions (1/ St) are validated with various type of boiling processes and the protocol (i.e. based on the slope of h versus ∆T curve rather than boiling curve) is also valid for the identification of proper boiling regime.
Highlights
Boiling is a solid-liquid interfacial behavior which is observed during various types of quenching such as cooling by pool of liquid, spray, air atomized spray, water jet and siphons[1,2]
It is recommended that the boiling behaviour is identified from the nature of the Q versus ΔT diagram which is called as boiling diagram[6,7]
The literature indicates that the amount and the nature of energies extracted in case of very slow boiling process are almost similar to the heat removal rate achieved for intense forced convection cooling by air[8]
Summary
Boiling is a solid-liquid interfacial behavior which is observed during various types of quenching such as cooling by pool of liquid, spray, air atomized spray, water jet and siphons[1,2]. Without the existence of the boiling behaviour in many cooling processes, a curve, which is qualitatively similar to the nature of the boiling diagram generates. In case of quenching by conventional spray and air atomized spray, the heat transfer behaviour is characterized or defined from the nature of boiling predicted by boiling diagram.
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