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Convective Heat Transfer Measurements in a Vapour-Liquid-Liquid Three-Phase Direct Contact Heat Exchanger

Mahood, Hameed B., Campbell, Alasdair, Baqir, Ali Sh., Sharif, Adel and Thorpe, Rex (2017) Convective Heat Transfer Measurements in a Vapour-Liquid-Liquid Three-Phase Direct Contact Heat Exchanger Heat and Mass Transfer, 54 (6). pp. 1697-1705.

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Abstract

Energy usage is increasing around the world due to the continued development of technology, and population growth. Solar energy is a promising low-grade energy resource that can be harvested and utilised in different applications, such solar heater systems, which are used in both domestic and industrial settings. However, the implementation of an efficient energy conversion system or heat exchanger would enhance such low-grade energy processes. The direct contact heat exchanger could be the right choice due to its ability to efficiently transfer significant amounts of heat, simple design, and low cost. In this work, the heat transfer associated with the direct contact condensation of pentane vapour bubbles in a three-phase direct contact condenser is investigated experimentally. Such a condenser could be used in a cycle with a solar water heater and heat recovery systems. The experiments on the steady state operation of the three-phase direct contact condenser were carried out using a short Perspex tube of 70 cm in total height and an internal diameter of 4 cm. Only a height of 48 cm was active as the direct contact condenser. Pentane vapour, (the dispersed phase) with three different initial temperatures (40℃,43.5℃ and 47.5℃) was directly contacted with water (the continuous phase) at 19℃. The experimental results showed that the total heat transfer rate per unit volume along the direct contact condenser gradually decreased upon moving higher up the condenser. Additionally, the heat transfer rate increases with increasing mass flow rate ratio, but no significant effect on the heat transfer rate of varying the initial temperature of the dispersed phase was seen. Furthermore, both the outlet temperature of the continuous phase and the void fraction were positively correlated with the total heat transfer rate per unit volume, with no considerable effect of the initial temperature difference between the dispersed and continuous phases.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :
NameEmailORCID
Mahood, Hameed B.
Campbell, Alasdaira.n.campbell@surrey.ac.uk
Baqir, Ali Sh.
Sharif, AdelA.Sharif@surrey.ac.uk
Thorpe, RexRex.Thorpe@surrey.ac.uk
Date : 28 December 2017
Identification Number : 10.1007/s00231-017-2260-8
Copyright Disclaimer : © Springer-Verlag Berlin Heidelberg 2017
Uncontrolled Keywords : Three-phase direct contact condenser; Heat transfer rate per unit volume; Solar water heater
Related URLs :
Depositing User : Clive Harris
Date Deposited : 21 Dec 2017 13:33
Last Modified : 13 Jul 2018 08:21
URI: http://epubs.surrey.ac.uk/id/eprint/845500

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