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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

ENHANCEMENT OF DESALINATION PROCESS INVOLVING TWO PHASE HEAT TRANSFER: AN EXPERIMENTAL STUDY

Rajiva Lochan Mohanty
School of Mechanical Sciences, Indian Institute of Technology Bhubaneswar, Odisha 752050, India

Abhilas Swain
School of Mechanical Sciences, Indian Institute of Technology Bhubaneswar, Odisha 752050, India

Mihir Kumar Das
School of Mechanical Sciences, Indian Institute of Technology Bhubaneswar, Odisha 752050, India

DOI: 10.1615/IHTC16.bae.023998
pages 1439-1448


KEY WORDS: Boiling and evaporation, Porous media, Two phase heat transfer, porous coated surface and surfactant SDS

Abstract

In the present article, two phase heat transfer experiments are conducted on plain and porous coated circular tubes of 20 mm diameter with an effective heating length of 130 mm, in a quiescent pool of fluid at 1 atmospheric pressure. The Nacl solution and a mixture Sodium Chloride and Sodium dodecyl sulfate solution are taken as working fluid. The heat flux is varied within 20.19-70.25kW/m2. The concentration of SDS varies from 100-1200 ppm. The two phase boiling heat transfer coefficient increases with the increase in heat flux. The coated tube provides higher two phase heat transfer coefficient than plain tube with NaCl solution with an enhancement of 51.43-65.74%. With increasing the concentration of SDS, the two phase transfer decreases. The maximum value of two phase heat transfer coefficient found at SDS 400ppm and minimum at 1200ppm. As compared to plain NaCl solution, the plain tube gives an enhancement of 48.24-57.71% in two phase heat transfer coefficient at SDS 400ppm. However, the minimum enhancement of 10.45-15.43% found in coated tube at SDS400ppm than coated tube with plain NaCl. Though both the tube surfaces provide enhancement in two phase heat transfer with SDS solution, but the maximum percentage of enhancement found in plain tube than coated tube. Therefore, either coated surface with NaCl solution or plain surface with SDS solution are preferable for enhancement of the desalination process.

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