THERMAL SCIENCE

International Scientific Journal

Hameed B. Mahood

,

Adel O. Sharif

,

Sami Al-Ailbi

,

Ali Hossini

,

Rex B. Thorpe

HEAT TRANSFER MODELLING OF TWO-PHASE BUBBLES SWARM CONDENSING IN THREE - PHASE DIRECT - CONTACT CONDENSER

ABSTRACT
An analytical model for the convective heat transfer coefficient and the two-phase bubble size of a three-phase direct contact heat exchanger was developed. Until the present, there has only been a theoretical model available that deals with a single two-phase bubble and a bubble train condensation in an immiscible liquid. However, to understand the actual heat transfer process within the three-phase direct contact condenser, characteristic models are required. A quasi - steady energy equation in a spherical coordinate system with a potential flow assumption and a cell model configuration has been simplified and solved analytically. The convective heat transfer in terms of Nu number has been derived, and it was found to be a function to Pe number and a system void fraction. In addition, the two-phase bubble size relates to the system void fraction and has been developed by solving a simple energy balance equation and using the derived convective heat transfer coefficient expression. Furthermore, the model correlates well with previous experimental data and theoretical results.
KEYWORDS
direct contact heat transfer, direct contact condenser, cell model, two-phase bubble swarm, heat transfer coefficient, two-phase bubbles size
PAPER SUBMITTED: 2013-02-19
PAPER REVISED: 2013-12-13
PAPER ACCEPTED: 2014-01-31
PUBLISHED ONLINE: 2014-03-08
DOI REFERENCE: https://doi.org/10.2298/TSCI130219015M
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2016, VOLUME 20, ISSUE Issue 1, PAGES [143 - 153]
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Heat transfer modelling of two-phase bubbles swarm condensing in three - phase direct - contact condenser

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