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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/11361
Title: Effect of Surface Tension Variation of the Working Fluid on the Performance of a Closed Loop Pulsating Heat Pipe
Authors: Kumar M.
Kant R.
Das, Arup Kumar
Das P.K.
Published in: Heat Transfer Engineering
Abstract: In 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.
Citation: Heat Transfer Engineering (2019), 40(7): 509-523
URI: https://doi.org/10.1080/01457632.2018.1436390
http://repository.iitr.ac.in/handle/123456789/11361
Issue Date: 2019
Publisher: Taylor and Francis Ltd.
ISSN: 1457632
Author Scopus IDs: 57209558895
57210438895
47161010300
35600687800
Author Affiliations: Kumar, M., Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, Kharagpur, India
Kant, R., Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, Kharagpur, India
Das, A.K., Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, India
Das, P.K., Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, Kharagpur, India
Funding Details: Arup 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.
Corresponding Author: Das, P.K.; Department of Mechanical Engineering, Indian Institute of Technology KharagpurIndia; email: pkd@mech.iitkgp.ernet.in
Appears in Collections:Journal Publications [ME]

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