Measurements of the velocity field of the laminar boundary layer for water free convection along an isothermal vertical flat plate

• Autorzy: Shang D. Y. , Wang B. X. , Takhar H. S.
• Języki publikacji: EN

Abstrakty

EN

The velocity field of laminar free convection for water flowing past an isothermal vertical flat plate is measured for different temperature conditions using the laser Doppler velocimetry. In the experiment, the temperatures on the vertical surface and in the ambient water are controlled at tw=40oC and t*=20oC and tw=60oC and t*=20oC, respectively. The laser Doppler velocimeter is employed using a technique of frequency deviation shift so that it can accurately measure a smaller velocity field of a fluid, such as the velocity of water free convection. For each temperature condition the velocity field wx is measured at heights of 0.05, 0.10, 0.15, and 0.20m. For comparison of the measured results with calculated values, corresponding numerical calculations considering variable thermophysical properties are carried out. By the use of similarity variables, the numerical solutions are transformed to the corresponding dimensionless values, and the experimental data are transformed to the associated dimensionless velocities. The experimental data and the numerical solutions of the velocity field are listed in the tables and plotted in figures. A very good agreement between the measured and calculated values is observed.

Słowa kluczowe

EN

free convection; laminar boundary layer; laser Doppler velocimetry; vertical plate

PL

hydromechanika

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: Applied Mechanics and Engineering
• Rocznik: 1998
• Tom: Vol. 3, no 4
• Strony: 553--570
• Opis fizyczny: Bibliogr. 8 poz., rys., tab., wykr.

Twórcy

autor

Shang D. Y.

autor

Wang B. X.

autor

Takhar H. S.

• Department of Fenous Metallurgy, Northeastern University, Shenyang, CHINA