Natural convection analysis of water near its density extremum between finite vertical plates: a differential transform approach. (23rd May 2019)

• Record Type: Journal Article
• Authors: Chiba, Ryoichi
• Is Part Of: International journal of mathematical modelling and numerical optimisation. Volume 9:Number 4(2019)
• Page Start: 429
• Page End: 448
• Publication Date: 2019-05-23
• Subjects: cold water -- DTM -- differential transform method -- semi-analytical method -- natural convection -- temperature-dependent property -- vertical channel -- series solution -- mathematical modelling -- heat transfer -- convective flow -- density extremum; Mathematical models -- Periodicals; Mathematical optimization -- Periodicals; 519.605
• Languages: English
• ISSNs: 2040-3607

Abstract

Using a two-dimensional differential transform method, we solve the steady natural convection problem of cold water between vertical isothermal plates of finite length. The cold water exhibits a density variation approximated as a quadratic function of temperature. Given the temperature-dependent viscosity, we present approximate analytical solutions in the form of power series for temperature, vertical flow velocity, and pressure defect. Numerical calculations are carried out for two cases of water temperature in which the following occur with respect to increases in temperature: 1) the density decreases monotonously; 2) the density increases and subsequently decreases. The numerical results reveal how the temperature-dependent properties affect the developing temperature and velocity profiles and pressure defect distribution along the streamwise direction.