Drag on an oscillating rod in a non-Newtonian fluid
Technical Report
·
OSTI ID:5126760
- Pittsburgh Univ., PA (United States). Dept. of Mechanical Engineering
- USDOE Pittsburgh Energy Technology Center, PA (United States)
In recent years there has been some interest in the calculation of the wall shear stress and drag for the flow of non-Newtonian fluids (such as coal-slurries) past solid surfaces. Stokes (1986) obtained an exact solution for the rotational oscillations of an infinite cylindrical rod in a Newtonian fluid. Casarella and Laura (1969) considered the problem when the rod is undergoing both torsional and longitudinal oscillations. This type of flow has relevance to several important technical applications, such as off-shore drilling and the sea-state excitation of rods and cables. Rajagopal (1983) studied the problem of an infinite rod undergoing both torsional and longitudinal oscillations in an incompressible second grade fluid. In this work, we continue his work to calculate the drag force on an oscillating rod. The shear stresses at the surface of the oscillating cylinder are calculated for different values of the non-Newtonian parameter {cflx a}''. The results are compared with the analytical results available in literature for the case of Newtonian fluid and the agreement is very good. Furthermore, the values for the work done in a complete cycle of motion are presented in a table for different values of {cflx a}''.
- Research Organization:
- USDOE Pittsburgh Energy Technology Center, PA (United States)
- Sponsoring Organization:
- DOE; USDOE, Washington, DC (United States)
- OSTI ID:
- 5126760
- Report Number(s):
- DOE/PETC/TR-92/8; ON: DE92014746
- Country of Publication:
- United States
- Language:
- English
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