Heat transfer enhancement in microchannels with liquid-liquid slug flow

Bandara, P 2015, Heat transfer enhancement in microchannels with liquid-liquid slug flow, Doctor of Philosophy (PhD), Aerospace, Mechanical and Manufacturing Engineering, RMIT University.

Document type: Thesis
Collection: Theses

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Title Heat transfer enhancement in microchannels with liquid-liquid slug flow
Author(s) Bandara, P
Year 2015
Abstract The use of microchannels for fluid conduits has significant advantages in a variety of applications. Some of these applications include heat exchangers, micro-reactors, lab-on-a-chip, micro-electronics cooling, and micro-electro-mechanical systems (MEMS). Two-phase flow without phase change can radically increase the heat and mass transfer rates in microchannels due to the internal recirculation of the fluids. These two-phase flows are either made up of gas–liquid or immiscible liquid–liquid slug flows. Liquid-liquid slug flow has gained more attention recently due to the better thermal properties of liquids compared to gases. While there have been extensive studies on gas-liquid slug flow, there is little information available on liquid-liquid slug flow, particularly during heat transfer.

Thus, this research presents the hydrodynamics and thermal characteristics of liquid-liquid slug flows in micro/mini channels.The research project involves both experimental and numerical investigations and the study is categorised into three main components; namely slug flow formation and visualization, pressure drop measurements and heat transfer studies. Both experimental and numerical studies showed a significant increase of heat transfer rates in liquid-liquid slug flow compared to it single phase counterpart. The modelling and experiments were carried out for a wide range of flow parameters, and the effect of those parameters on heat transfer is presented.
Degree Doctor of Philosophy (PhD)
Institution RMIT University
School, Department or Centre Aerospace, Mechanical and Manufacturing Engineering
Keyword(s) heat transfer
slug flow
Taylor flow
pressure drop
film thickness
flow visualization
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Created: Fri, 21 Aug 2015, 10:39:23 EST by Denise Paciocco
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