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- Title
Application of a Differential Transform Method to the Transient Natural Convection Problem in a Vertical Tube with Variable Fluid Properties.
- Authors
Chiba, Ryoichi
- Abstract
The transient natural convection of a viscous fluid in a heated vertical tube is studied using the two-dimensional differential transform method (DTM). A time-dependent Dirichlet boundary condition is imposed for tube wall temperature. The partial differential equations for the velocity and temperature fields within the tube are solved by the DTM while considering temperature-dependent viscosity and thermal conductivity of the fluid. As a result, tractable solutions in double-series form are derived for the temperature and flow velocity. The transformed functions included in the solutions are obtained through a simple recursive procedure. Numerical results illustrate the effects of temperature-dependent properties on transient temperature and flow behaviour, including the Nusselt number and volumetric flow rate. The DTM gives accurate series solutions without any special functions for nonlinear transient heat transfer problems which are advantageous in finding the derivative or integral.
- Subjects
NATURAL heat convection; DIFFERENTIAL transformers; DIRICHLET principle; THERMAL conductivity; VISCOSITY
- Publication
Zeitschrift für Naturforschung Section A: A Journal of Physical Sciences, 2016, Vol 71, Issue 2, p185
- ISSN
0932-0784
- Publication type
Article
- DOI
10.1515/zna-2015-0347