IJE TRANSACTIONS A: Basics Vol. 31, No. 1 (January 2018) 124-131    Article in Press

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G. Thakur, G. SINGH, M. Thakur and S. Kajla
( Received: April 18, 2017 – Accepted: November 30, 2017 )

Abstract    Shell and Tube heat exchangers are the heat exchangers that are most widely used in the industries and in other commercial purposes. There have been many techniques that have been utilised to enhance the heat transfer performance of the shell and tube heat exchangers. Air bubble injection is one of the promising and inexpensive techniques that can create turbulence in the fluids resulting in to enhancement of heat transfer characteristics of the shell and tube heat exchangers. In this paper, experimental study of heat transfer characteristics have been done by injecting air bubbles at tube inlet and through out the tube for 0.1%v/v and 0.2%v/v Al2O3 nanopartices concentraion .Results obtained at two different injection points for both the concentrations are compared with the case when no air bubble injection is done. The results showed the enhancement in the heat transfer characteristics with air bubble injection and volumetic concentration of nanoparticles. The maximum enhancement was found to be in the case where air bubbles are injected throughout the tube which is followed by the air bubble injection at the tube inlet and without air bubble injection. Morever,enhancement found to be more with 0.2%v/v than 0.1% v/v as the heat transfer charactesistics of nanofluids increase with increase in volumetric concentration of nanoparticles.


Keywords    Shell and Tube heat exchanger, Nanofluids, Heat transfer coefficient, Nusselt number


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