Further experimental evidence that condensation is a major cause of airflow

Bunyard, Peter P.; Hodnett, Martin; Peña, Carlos; Burgos-Salcedo, Javier D.. 2019 Further experimental evidence that condensation is a major cause of airflow. DYNA, 86 (209). 56-63. 10.15446/dyna.v86n209.73288

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Abstract/Summary

This paper further explores the physics of water condensation, using an experimental structure designed for that purpose. The data show a highly significant correlation (R2 >0.94, p value <0.001) between observed airflows and partial pressure changes from condensation, when the results of different experiments are pooled. Changes in air density on cooling provide insufficient energy to account for the airflow. The finding is that the kinetic energy of the chilled air falls short by an order of magnitude, even to move a relatively small proportion of the 20 kg of air contained within the structure. Meanwhile the physics of condensation indicate a surplus of kinetic energy is made available from the air surrounding the locus of condensation. At low rates of condensation a considerable proportion of the available kinetic energy in the enclosed air is absorbed in friction and turbulence. That proportion reduces with higher rates of condensation.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.15446/dyna.v86n209.73288
UKCEH and CEH Sections/Science Areas:	Unaffiliated
ISSN:	0012-7353
Additional Information. Not used in RCUK Gateway to Research.:	Open Access paper - full text available via Official URL link.
Additional Keywords:	airflow, energy of condensation, energy of air density
NORA Subject Terms:	Atmospheric Sciences
Date made live:	19 Nov 2019 16:09 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/525960

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