Absorption of steam bubbles in lithium bromide solution

Philip Donnellan, Kevin Cronin, William Lee, Shane Duggan, Edmond Byrne

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Absorption heat transformers are thermodynamic cycles that are capable of recycling waste heat energy by increasing its temperature. One of the most important unit operations in a heat transformer is the exothermic absorption of water vapour into a solution of choice at a higher temperature. Bubble columns are potentially an efficient means of achieving this. An experimental analysis is conducted which examines the absorption of single steam bubbles into a concentrated aqueous lithium bromide solution. The bubbles are tracked using a high speed camera, and their rate of absorption is modelled using a simple ordinary differential equation model. Accurate model predictions are obtained when oscillating bubble Nusselt and the Sherwood number correlations are utilised. The proposed model is capable of describing 96% of the observed experimental variability. Very large mass transfer coefficients of approximately 0.0012. m/s are obtained, which is higher than any previously reported values used in heat transformer absorber design.

Original languageEnglish
Pages (from-to)10-21
Number of pages12
JournalChemical Engineering Science
Volume119
Early online date5 Aug 2014
DOIs
Publication statusPublished - 8 Nov 2014
Externally publishedYes

Fingerprint

Steam
Bubbles (in fluids)
Bubble
Transformer
Lithium
Absorption
Heat
Bubble columns
High speed cameras
Waste heat
Bubble Column
Ordinary differential equations
High-speed Camera
Water vapor
Recycling
Water Vapor
Mass Transfer
Absorber
Experimental Analysis
Mass transfer

Cite this

Donnellan, Philip ; Cronin, Kevin ; Lee, William ; Duggan, Shane ; Byrne, Edmond. / Absorption of steam bubbles in lithium bromide solution. In: Chemical Engineering Science. 2014 ; Vol. 119. pp. 10-21.
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Absorption of steam bubbles in lithium bromide solution. / Donnellan, Philip; Cronin, Kevin; Lee, William; Duggan, Shane; Byrne, Edmond.

In: Chemical Engineering Science, Vol. 119, 08.11.2014, p. 10-21.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Absorption of steam bubbles in lithium bromide solution

AU - Donnellan, Philip

AU - Cronin, Kevin

AU - Lee, William

AU - Duggan, Shane

AU - Byrne, Edmond

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