PRESSURE-DROP MEASUREMENTS IN THE TRANSITION REGION FOR A CIRCULAR TUBE WITH 3-DIFFERENT INLET CONFIGURATIONS

被引：54

作者：

GHAJAR, AJ

MADON, KF

机构：

[1] School of Mechanical and Aerospace Engineering, Oklahoma State University, Stillwater, OK

来源：

EXPERIMENTAL THERMAL AND FLUID SCIENCE | 1992年 / 5卷 / 01期

基金：

美国国家科学基金会;

关键词：

PRESSURE DROP; TRANSITION REGION; FRICTION FACTOR; CIRCULAR TUBE; HEAT EXCHANGERS;

D O I：

10.1016/0894-1777(92)90062-A

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Pressure drop measurements were made in a horizontal circular straight tube with reentrant, square-edged, and bell-mouth inlets under isothermal flow conditions. The experiments covered a Reynolds number range from about 500 to 15,000. The fully developed skin friction coefficients for the three inlet configurations showed that the range of Reynolds number values for which transition flow exists is 1980-2600 for the reentrant inlet, 2070-2840 for the square-edged inlet, and 2125-3200 for the bell-mouth inlet. A correlation for prediction of the fully developed skin friction coefficient in the transition region for each inlet is recommended. In the entrance region, qualitative results are presented for the variation of laminar apparent friction factor with tube length for different inlets. Available friction factor correlations in the laminar entrance and fully developed transition regions are compared with our experimental data for different inlets.

引用

页码：129 / 135

页数：7

共 17 条

[1]

Shah, Johnson, Correlations for Fully Developed Turbulent Flow Through Circular and Noncircular Channels, Proc. Sixth National Heat and Mass Transfer Conf., (1981)

[2]

Kakac, Shah, Aung, Handbook of Single-Phase Convective Heat Transfer, (1987)

[3]

Ghajar, Strickland, Kuppuraju, Forced and Mixed Convective Heat Transfer Measurements in a Circular Tube with Different Inlets, Mixed Convection, 152 HTD–Vol., pp. 37-45, (1990)

[4]

Kong, Intermittency Factor Measurements in the Transition Region for a Circular Tube with Square-Edged and Re-entrant Entrances, M.S. Report, (1990)

[5]

Augustine, Pressure Drop Measurements in the Transition Region for a Circular Tube with a Square-Edged Entrance, M.S. Thesis, (1990)

[6]

Morel, Comprehensive Design of Axisymmetric Wind Tunnel Contractions, Journal of Fluids Engineering, 97, pp. 223-225, (1975)

[7]

Bohn, Fischer, Obermier, Thermal Conductivity Density Viscosity and Prandtl Numbers of Ethylene Glycol-Water Mixtures, Berichte der Bunsengesellschaft für physikalische Chemie, 88, pp. 739-742, (1984)

[8]

Ghajar, Zurigat, Microcomputer-Assisted Heat Transfer/Analysis in a Circular Tube, J. Appl. Eng. Educ., 7, 2, pp. 125-134, (1991)

[9]

Blasius, Das Ähnlichkeitsgesetz bei Reibungsvorgängen in Flüssigkeiten, Forsch. Arb. Ing.-Wes., 131, (1913)

[10]

Kline, McClintock, Describing Uncertainties in Single Sample Experiments, Mech. Eng., 75, 1, pp. 3-8, (1953)

← 1 2 →