Fluid flow and heat transfer over a rotating and vertically moving disk

By Mustafa Turkyilmazoglu. The Physics of Fluids, 2018

138 citations recorded by the source corpus.

The object of this study is the development of the fluid flow and resultant heat transfer caused by a rotating disk moving vertically upward or downward during an unsteady flow motion. The problem is formulated such that the similarity equations governing the physical phenomenon eventually reduced to those reported in the traditional viscous pumping study of von Karman for a vertically motionless but still rotating disk. The non-rotating disk with the upward or downward motion leads to the formation of a two-dimensional flow over the disk. Otherwise, the rotation and vertical action of the disk sets up a three-dimensional flow over the surface. It is observed that the upward and downward motion of the disk exerts an effect similar to that of the injection/suction through the wall, albeit with observable differences. Moreover, the viscous pumping is found to be a jet-like radial velocity as the disk moves upward fast. Although the downward movement of the disk suppresses the velocity field, a growth in the boundary layer thickness is anticipated, contrary to the traditional wall suction. The temperature field is shown to be highly dependent on the form of the wall temperature, which is maintained at a time-varying function. Moreover, the impact of the vertical wall movement is observed to be overwhelmed by high disk rotations.The object of this study is the development of the fluid flow and resultant heat transfer caused by a rotating disk moving vertically upward or downward during an unsteady flow motion. The problem is formulated such that the similarity equations governing the physical phenomenon eventually reduced to those reported in the traditional viscous pumping study of von Karman for a vertically motionless but still rotating disk. The non-rotating disk with the upward or downward motion leads to the formation of a two-dimensional flow over the disk. Otherwise, the rotation and vertical action of the disk sets up a three-dimensional flow over the surface. It is observed that the upward and downward motion of the disk exerts an effect similar to that of the injection/suction through the wall, albeit with observable differences. Moreover, the viscous pumping is found to be a jet-like radial velocity as the disk moves upward fast. Although the downward movement of the disk suppresses the velocity field, a growth in the...

Subfields: Biomedical Engineering, Computational Mechanics, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/b7bb190eb74a77f14b7cff4fd8944f9a81569adf

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In Biomedical Engineering

1. Punith Gowda Ramanahalli Jayadevamurthy
2. B. C. Prasannakumara
3. Kottakkaran Sooppy Nisar
4. N. Rangaswamy

In Computational Mechanics

1. Punith Gowda Ramanahalli Jayadevamurthy
2. B. C. Prasannakumara
3. Kottakkaran Sooppy Nisar
4. N. Rangaswamy

In Mechanical Engineering

1. Punith Gowda Ramanahalli Jayadevamurthy
2. B. C. Prasannakumara
3. Kottakkaran Sooppy Nisar
4. N. Rangaswamy

Citations in the corpus

• Emphasis on unsteady dynamics of bioconvective hybrid nanofluid flow over an upward–downward moving rotating disk (2020, methodology): “The Arrhenius energy of activation along with chemical reaction and bioconvection ]) and Turkyilmazoglu [25]).”