Numerical Investigation of the Effect of Moisture on Buoyancy-driven Low Turbulence Flow in an Enclosed Cavity

Iyi, Draco and Hasan, Reaz (2019) Numerical Investigation of the Effect of Moisture on Buoyancy-driven Low Turbulence Flow in an Enclosed Cavity. International Journal of Heat and Mass Transfer, 136 (Jun-19). pp. 543-554. ISSN 0017-9310

[img] Spreadsheet
Author accepted Manuscript-numerical investigation of the effect of moisture.pdf - Accepted Version
Restricted to Repository staff only until 9 March 2021.
Available under License Creative Commons Attribution Non-commercial No Derivatives.

Download (4MB) | Request a copy

Abstract

This paper reports a numerical investigation of low turbulence buoyancy-driven flow of moist air and heat transfer inside a rectangular cavity with differentially heated vertical walls. The variations of the flow, temperature and moisture inside the cavity has been analysed together with heat transfer coefficients for a range of mass fraction of water vapour and temperature gradients between the vertical walls of the cavity. The accuracy of the numerical methodology was also scrutinised by conducting a rigorous validation study of benchmark experimental data for the average Nusselt number for similar buoyancy driven cavity flow.

The results of this investigation showed that during the natural convection process, the change in moisture content in the moist air has a significant influence on the flow and temperature fields inside the enclosure and the variation of the vertical wall temperature gradients have also shown to affect the moisture concentration inside the cavity. The percentage change in the average heat transfer varied significantly depending on the mass fraction of moisture in the air and the temperature gradient between the vertical walls. The results also showed a 3.5% increase in the average heat transfer for every 0.02 kg/kg increment in the mass fraction of water vapour. The findings from the study are significance to scientists and practitioners who are responsible for moisture management in enclosed space at the design threshold and for optimisation of energy used in buildings.

Item Type: Article
Uncontrolled Keywords: Natural convection, Buoyancy-driven flow, Moisture transport, Heat transfer, Computational Fluid Dynamics.
Subjects: G900 Others in Mathematical and Computing Sciences
H100 General Engineering
H800 Chemical, Process and Energy Engineering
Divisions: Faculty of Computing, Engineering and the Built Environment
Faculty of Computing, Engineering and the Built Environment > School of Engineering and the Built Environment
Depositing User: Euan Scott
Date Deposited: 15 Mar 2019 14:40
Last Modified: 15 Mar 2019 14:40
URI: http://www.open-access.bcu.ac.uk/id/eprint/7256

Actions (login required)

View Item View Item

Research

In this section...