Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/139435
Title: Experimental study on the droplet formation around pins of different geometry for the design of a compact falling-droplet absorber
Authors: Cola, Fabrizio
Romagnoli, Alessandro
Hey, Jonathan
Keywords: Engineering::Mechanical engineering
Issue Date: 2018
Source: Cola, F., Romagnoli, A., & Hey, J. (2018). Experimental study on the droplet formation around pins of different geometry for the design of a compact falling-droplet absorber. Heat and Mass Transfer, 54, 3599-3616. doi:10.1007/s00231-018-2381-8
Journal: Heat and Mass Transfer
Abstract: Absorber downsizing for the development of compact absorption chillers is a known challenge of this type of refrigerator. Past studies have revealed how a droplet flow regime can increase the interface area and enhance absorption rates, especially during the droplet formation. This study proposes a space-efficient design for an adiabatic absorber based on a bank of solid pins coupled with a droplet flow regime. Manufacturing through 3D printing technique is used to study the effect of different fin shapes during droplet formation. Droplet behavior is firstly studied analytically through a variational approach. Experiments on pure water are then carried out to validate the model and produce design guidelines for a H2O-LiBr absorber. Results show that the analytical model is more accurate in the regions close to the droplet bottom. The rhomboidal geometry with 120° returned the smallest droplet volume without allowing coalescence of more droplets, ensuring the maintenance of droplet flow and a high surface area for mass transfer. Disturbances in the droplet profiles were observed, caused by the pin-droplet interaction. A map has been then created to allow a quick sizing of the absorber and find its main geometrical and operational features.
URI: https://hdl.handle.net/10356/139435
ISSN: 0947-7411
DOI: 10.1007/s00231-018-2381-8
Rights: © 2018 Springer-Verlag GmbH Germany, part of Springer Nature. All rights reserved. This paper was published in Heat and Mass Transfer and is made available with permission of Springer-Verlag GmbH Germany, part of Springer Nature.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MAE Journal Articles

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