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ABSTRACT
Boiling heat transfer enhancement is influenced by the surface distinctiveness of the boiling region. Porous surface is being widely used to enhance boiling heat transfer in the industry. An experimental study is carried out to investigate the characteristics of the pool boiling heat transfer for different fluid, namely, pure refrigerant (R-134a) and quasi-azeotropic mixture (R-410A). The test is performed on a thin porous layer over a copper tube placed horizontal at saturation temperature of 7°C and also to determine its potential application to flooded refrigerant evaporators. The diameter of the coated tube was 25.4 mm, a length of 116 mm. A coated tube had a porous layer thickness of 42.2 µm. In the experimental range (5 to 50 kWm−2) the boiling heat transfer coefficients are 1.25 to 2 times higher than those of the uncoated surface. For boiling within the porous surface, simplified predicted equations of various investigators are analyzed.
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Notes on contributors
Ashok K. Dewangan
Ashok Kumar Dewangan is a Research Scholar in the Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee, India. He received his undergraduate degree from National Institute of Technology, Raipur, Chhattisgarh and Postgraduate degree from Indian Institute of Technology, Kharagpur, West Bengal. He is currently working in the area of boiling heat transfer of pure and quasi-azeotropic refrigerants.
Anil Kumar
Anil Kumar is an Associate Professor in the Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee. He received his postgraduate, and Ph.D. degrees in mechanical engineering from the University of Roorkee. He has 25 years of teaching experience. His main areas of research are heat transfer, refrigeration, and air conditioning, solar energy, energy systems, and boiling of refrigerants.
Ravi Kumar
Ravi Kumar is a Professor in the Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee, India. He has 15 years of teaching experience and 1 year of industrial experience. His areas of specialization are refrigeration and air-conditioning; two-phase flow and heat transfer; and instrumentation and measurements. Currently he is working in the area of boiling and condensation of refrigerants; transfer processes in capillaries and micro-channels; nuclear safety, and LOCA.