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MHD natural convection flow past an impulsively moving vertical plate with ramped wall temperature in the presence of thermal diffusion with heat absorption

100%

Seth G. S. , Ansari M. S.

tom Vol. 15, no 1

199-215

Hydromagnetic natural convection flow of a viscous incompressible electrically conducting and heat-absorbing fluid past an impulsively moving vertical plate with ramped wall temperature in a porous medium, in the presence of thermal diffusion, is studied. The exact solution of momentum and energy equations, under the Boussinesq approximation, is obtained in closed form by the Laplace transform technique. The expressions for the skin friction and Nusselt number are also derived. The variations in fluid velocity and temperature are shown graphically whereas numerical values of skin friction and the Nusselt number are presented in tabular form for various values of pertinent flow parameters. The natural convection flow near a ramped temperature plate is also compared with the flow near an isothermal plate.

Fractional heat conduction in an infinite rod with heat absorption proportional to temperature

100%

Povstenko Y. , Klekot J.

tom Vol. 22

61--71

The one-dimensional time-fractional heat conduction equation with heat absorption (heat release) proportional to temperature is considered. The Caputo time-fractional derivative is utilyzed. The fundamental solutions to the Cauchy and source problems are obtained using the Laplace transform with respect to time and the exponential Fourier transform with respect to the spatial coordinate. The numerical results are illustrated graphically.

The fundamental solutions to the central symmetric time-fractional heat conduction equation with heat absorption

67%

Povstenko Y. , Klekot J.

2017

tom Vol. 16, nr 2

101--112

The time-fractional heat conduction equation with heat absorption proportional to temperature is considered in the case of central symmetry. The fundamental solutions to the Cauchy problem and to the source problem are obtained using the integral transform technique. The numerical results are presented graphically.

Estimation of the Overall Heat - transfer Coefficient Through a Textile Layer

67%

Ziegler S. , Kucharska-Kot J.

Fibres & Textiles in Eastern Europe

2006

tom Vol. 14, no. 5 (59)

103--106

The article justifies the use of calculative determination of the heat transfer coefficient k, on the basis of immutable parameters of the textile layer such as thermal conductivity and thickness. A method of elaborating the heat transfer coefficient is described, and examples of calculations are presented for randomly selected samples of clothing woven fabrics. It was proved possible to make a calculative estimation of the influence of changes on the parameters of the textile layer, as well as the conditions of use on the value of the heat transfer coefficient. No estimation of the woven fabrics tested from the point of view of their properties was carried out. A brief description of a device for measuring the thermal conductivity coefficient and the heat transfer coefficient of flat textile products is presented.

W artykule wykazano celowość obliczeniowego określania współczynnika przenikania ciepła k, na podstawie stałych parametrów warstwy odzieży: przewodności cieplnej i grubości warstwy. Przedstawiono metodę obliczania współczynnika k i wykonano obliczenia dla wybranych próbek tkanin odzieżowych. Przedstawiono opis przyrządu do pomiaru współczynnika przewodności cieplnej i współczynnika przenikania ciepła płaskich wyrobów włókienniczych. Wyniki pomiarów porównawczych wykazały dostateczną zgodność obliczeń z pomiarami. Wykazano możliwość obliczeniowej oceny wpływu zmian parametrów warstwy odzieży i warunków użytkowania na wartość współczynnika przenikania ciepła.