Moving and Rotating Sphere in the Thermal Entrance Region of a Heated Pipe
Author:
Shahcheraghi N.1, Dwyer H. A.1
Affiliation:
1. Mechanical and Aeronautical Engineering Department, University of California, Davis, CA 95616
Abstract
Flow and unsteady heat transfer around a moving and rotating sphere is considered as it passes through the thermal entrance region of a heated pipe. The flow is incompressible and viscous with constant properties, and the heated pipe wall is kept at a constant temperature. Two Peclet numbers of 25 and 100 are considered along with two sphere-to-pipe-diameter ratios of 0.2 and 0.4. The flow is made three dimensional by an eccentric positioning of the sphere inside the pipe. The governing equations are solved by a validated numerical method which uses a finite volume formulation in a generalized body-fitted coordinate system. An overset (Chimera) grid scheme is used to resolve the two geometries of the pipe and sphere. The results are presented in terms of the steady pressure and viscous lift and drag forces on the sphere. In addition the unsteady heat transfer characteristics of the flow are presented in terms of the local and overall Nusselt number evolution around the sphere as it passes through the thermal entrance region of the pipe. Sphere heat-up is also given as the lumped mass sphere temperature as a function of distance from the thermal entrance. [S0022-1481(00)02402-6]
Publisher
ASME International
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
Reference14 articles.
1. Kreith, F., and Bohn, M. S., 1986, Principles of Heat Transfer, 4th Ed. Harper and Row, New York. 2. Salazar, A. J., and Campo, A., 1990, “Prediction of the Thermal Entry Length Without Solving the Complete Entrance Length Problem,” Int. J. Heat Fluid Flow, 11, No. 1, Mar., pp. 48–53. 3. Clift, R., Grace, J. R., and Webber, M. E., 1978, Bubbles, Drops, and Particles, Academic Press, San Diego, CA. 4. Shahcheraghi, N., and Dwyer, H. A., 1998, “Fluid Flow and Heat Transfer Over 3-D Spherical Object in a Pipe,” ASME J. Heat Transfer, 120, p. 985985. 5. Dwyer, H. A.
, 1989, “Calculation of Droplet Dynamics in High Temperature Environments,” Prog. Energy Combust. Sci., 15, pp. 131–158.
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