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dc.contributor.authorKumar M.-
dc.contributor.authorKant R.-
dc.contributor.authorDas, Arup Kumar-
dc.contributor.authorDas P.K.-
dc.identifier.citationHeat Transfer Engineering (2019), 40(7): 509-523-
dc.description.abstractIn this article, the effect of surface tension variation of the working fluid on the thermal performance of a pulsating heat pipe (PHP) is presented. A two-turn closed loop PHP is fabricated with a combination of copper and quartz tubes having 2 mm inner diameter. Three filling ratios are considered in the present study. A common surfactant namely sodium dodecyl sulfate is used to vary the surface tension of the distilled water which is the base working fluid tested in the PHP. Visualization as well as heat transfer studies is performed in the PHP. Thermal resistances of working fluids with different surface tension are estimated for each filling ratio. Further, the effect of surfactant concentration on the hydrodynamics of the PHP is also discussed. Addition of surfactant induces formation of foam after the filling process and in some phase of PHP operation. It changes the flow regime boundaries and lowers the evaporator temperature under specific operating conditions. A flow regime map is also constructed for the present PHP. The working fluid with a lower surface tension gives a minimum evaporator temperature in the vertical orientation and thus, lowest thermal resistance has been obtained. However, surface tension does not influence the performance in the horizontal position appreciably. © 2018, © 2018 Taylor & Francis Group, LLC.-
dc.publisherTaylor and Francis Ltd.-
dc.relation.ispartofHeat Transfer Engineering-
dc.titleEffect of Surface Tension Variation of the Working Fluid on the Performance of a Closed Loop Pulsating Heat Pipe-
dc.affiliationKumar, M., Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, Kharagpur, India-
dc.affiliationKant, R., Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, Kharagpur, India-
dc.affiliationDas, A.K., Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, India-
dc.affiliationDas, P.K., Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, Kharagpur, India-
dc.description.fundingArup Kumar Das is Assistant Professor of Thermal Engineering at the Indian Institute of Technology (IIT) Roorkee, Uttarakhand, India. He received his M.S. and Ph.D. degrees from the IIT kharag-pur, India. His research contributions are in the two-phase flow and boiling heat transfer. He has published more than 50 research papers in reputed international journals. He is proactive in industrial research and book writing in the area of two-phase flow and heat transfer. He is the recipient of prestigious national fellowship from Indian National Science Academy and Indian National Academy of Engineers.-
dc.description.correspondingauthorDas, P.K.; Department of Mechanical Engineering, Indian Institute of Technology KharagpurIndia; email:
Appears in Collections:Journal Publications [ME]

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