Free convection of water at 4°C from a vertical flat plate with step discontinuities in surface temperature

• Autorzy: Postelnicu A.
• Języki publikacji: EN

Abstrakty

EN

The free convection boundary layer of water at 4° C from a vertical flat plate with step discontinuities in surface temperature is investigated here. Under a convenient transformation of variabIes, the problem is cast into a pair of partial differential equations, which are numerically solved using the well-known Keller-box method. Temperature and veloeity field developments are presented for various values of the parameter 8w2 whieh represents the step discontinuity in the surface temperature for both Pr=ll.4 and Pr=7. The loeal heat tlux is calculated in a dimensionless form and is plotted vs the streamwise coordinate for both water in the extremum and in normal conditions of density .

Słowa kluczowe

EN

free convection; water at extremum conditions of density; vertical flat plate

PL

warstwa graniczna; ciecz smarująca; smarowanie

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: International Journal of Applied Mechanics and Engineering
• Rocznik: 2007
• Tom: Vol. 12, no 3
• Strony: 767--779
• Opis fizyczny: Bibliogr. 7 poz., wykr.

Twórcy

autor

Postelnicu A.

• Department of Fluid Mechanics and Thermal Engineering Transilvania University Brasov, 500036, ROMANIA,

Bibliografia

• Gebhart B. and Mollendorf J.C. (1978): Buoyancy induced flows in water under conditions in which density extrema may arise. - J. Fluid Mechanics, vol.89, pp.673-707.
• Gebhart B., Jaluria Y., Mahajan R.L. and Sammakaia B. (1988): Buoyancy-induced flows and transport. - Washington: Hemisphere Publishing Corporation.
• Hayday A.A., Bowlus D.A. and McGraw R.A. (1967): Free convection from a vertical plate with step discontinuities in surface temperature. - Trans. of the ASME, J. Heat Transfer, vol.89, pp.244-250.
• Keller H.B. and Cebeci T. (1971): Accurate numerical method for boundary layer flows: two-dimensional laminar flows. - Proc. 2nd Int. Conf., on Numerical Methods in Fluid Dynamics, pp.92-100.
• Pantokratos A. (2003): A note on the Nusselt number adjacent to a vertical isothermal plate immersed in thermally stratified water at low temperatures. - Int. J. Heat and Fluid Flow, vol.24, pp.278-281.
• Soundalgekar V.M., Ramana Murty T.V. and Vighnesam N.V. (1984): Combined free and forced convective flow of water at 4ºC past a semi-infinite vertical plate. - Int. J. Heat and Fluid Flow, vol.5, pp.54-56.
• Takhar H.S., Slaouti A.S., Soundalgekar V.M. and Jaiswal B.S. (2000): Combined convection of water at 4ºC past a semi-infinite vertical plate. - Applied Mech. and Engineering, vol.5, pp.329-336.