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Journal of Enhanced Heat Transfer
IF: 0.562 5-Year IF: 0.605 SJR: 0.175 SNIP: 0.361 CiteScore™: 0.33

ISSN Print: 1065-5131
ISSN Online: 1026-5511

Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.2019029803
pages 471-486

INTERMITTENT LOW MASS FLUX SPRAY COOLING AT HIGH TEMPERATURE: A NOVEL METHODOLOGY FOR THE AUGMENTATION OF HEAT FLUX IN TRANSITION BOILING REGIME

Lily
Department of Chemical Engineering, National Institute of Technology Rourkela, Rourkela 769008, India
Soumya S. Mohapatra
Department of Chemical Engineering, National Institute of Technology Rourkela, Rourkela 769008, India
Basudeb Munshi
Department of Chemical Engineering, National Institute of Technology Rourkela, Rourkela 769008, India

ABSTRACT

In the absence of disadvantages of various cooling methodologies reported in the literature, in the current work, enhancement at high temperature by using low mass flux spray recommended for cooling of thin strip is achieved. By decreasing the droplet renewal rate and augmenting the residence time, the aforesaid has been achieved. In the current work, from the attainment of these conditions in the cooling process, the spray cooling was made intermittent. The result reveals that heat extraction rate enhances with increasing the mass flux from 0.25 × 10-6 to 9.25 × 10-6 kg/m2s and further increment in mass flux decreases the heat transfer rate. In addition, the obtained critical heat flux (CHF) is higher than the CHF achieved by changing the nozzle orientation and the achieved TCHF is lower in the case of a multispray low mass flux nozzle. Further, comparative study clearly reveals significant reduction of coolant consumption rate and operating pressure in comparison with the information reported in the literature. However, the CHF and heat transfer coefficient are comparable but lower.

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