To investigate the effect of insert on heat transfer in heat exchanger

mechnical engineering

Heat transfer enhancement has been always a significantly interesting topic in order to develop high efficient, low cost, light weight, and small heat exchangers. The energy cost and environmental issue are also encouraging researchers to achieve better performance than the existing designs. The various effective ways to achieve higher heat transfer rate in heat exchangers are using different kinds of inserts and modifying the heat exchanger tubes. The present work is on the heat transfer enhancement in a circular tube. In the present work emphasis is given to works dealing with analysis of different inserts and their effects on heat transfer rate because according to the recent studies, these are known to be economic in the field of heat transfer enhancement. The inner and outer diameters of the copper tube are 25 mm and 26.5 mm respectively. The twisted tapes were made of the copper and aluminium strip with thickness of 2mm and the length of 1220 mm. The effects of other three types of tapes including, The copper twisted tape with twist ratio (y) of 6.6 and 8.26 , (2) The aluminium twisted tape with twist ratio (y) of 6.0, are also studied for comparison. All twisted tapes used are twisted at constant twist length(y). Heat Transfer enhancement techniques are used to increase rate of Heat transfer. The heat transfer coefficient increases with Reynolds number. The experimental data obtained are compared with those obtained from plain tube. The heat transfer coefficient increases with twist ratio. The empirical correlations developed in terms of twist ratio, Reynolds number, Nusselt number and friction factor. Heat transfer techniques are mostly used in areas such as thermal power plants, air-conditioning equipment, radiators for space vehicles, automobiles, power sector, process industries, Industrial heat recovery, Electronics cooling, Aerospace.

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