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Numerical study of 2D heat transfer in a scraped surface heat exchanger

Numerical study of 2D heat transfer in a scraped surface heat exchanger
Numerical study of 2D heat transfer in a scraped surface heat exchanger
numerical study of fluid mechanics and heat transfer in a scraped surface heat exchanger with non-Newtonian power law fluids is undertaken. Numerical results are generated for 2D steady-state conditions using finite element methods. The effect of blade design and material properties, and especially the independent effects of shear thinning and heat thinning on the flow and heat transfer, are studied. The results show that the gaps at the root of the blades, where the blades are connected to the inner cylinder, remove the stagnation points, reduce the net force on the blades and shift the location of the central stagnation point. The shear thinning property of the fluid reduces the local viscous dissipation close to the singularity corners, i.e. near the tip of the blades, and as a result the local fluid temperature is regulated. The heat thinning effect is greatest for Newtonian fluids where the viscous dissipation and the local temperature are highest at the tip of the blades. Where comparison is possible, very good agreement is found between the numerical results and the available data. Aspects of scraped surface heat exchanger design are assessed in the light of the results.
0045-7930
869-880
Sun, K-H.
23866118-f1bf-4ec8-b4a4-d2cba026f1c5
Pyle, D.L.
2199ef38-3573-4e87-9925-7f067caca1eb
Fitt, A.D.
51b348d7-b553-43ac-83f2-3adbea3d69ab
Please, C.P.
118dffe7-4b38-4787-a972-9feec535839e
Baines, M.J.
8c52bd72-3cb7-4212-a061-77c7c7fbb4a5
Hall-Taylor, N.
e7f41ba7-6274-4b05-9c44-73625649df86
Sun, K-H.
23866118-f1bf-4ec8-b4a4-d2cba026f1c5
Pyle, D.L.
2199ef38-3573-4e87-9925-7f067caca1eb
Fitt, A.D.
51b348d7-b553-43ac-83f2-3adbea3d69ab
Please, C.P.
118dffe7-4b38-4787-a972-9feec535839e
Baines, M.J.
8c52bd72-3cb7-4212-a061-77c7c7fbb4a5
Hall-Taylor, N.
e7f41ba7-6274-4b05-9c44-73625649df86

Sun, K-H., Pyle, D.L., Fitt, A.D., Please, C.P., Baines, M.J. and Hall-Taylor, N. (2004) Numerical study of 2D heat transfer in a scraped surface heat exchanger. Computers & Fluids, 33 (5-6), 869-880. (doi:10.1016/j.compfluid.2003.06.009).

Record type: Article

Abstract

numerical study of fluid mechanics and heat transfer in a scraped surface heat exchanger with non-Newtonian power law fluids is undertaken. Numerical results are generated for 2D steady-state conditions using finite element methods. The effect of blade design and material properties, and especially the independent effects of shear thinning and heat thinning on the flow and heat transfer, are studied. The results show that the gaps at the root of the blades, where the blades are connected to the inner cylinder, remove the stagnation points, reduce the net force on the blades and shift the location of the central stagnation point. The shear thinning property of the fluid reduces the local viscous dissipation close to the singularity corners, i.e. near the tip of the blades, and as a result the local fluid temperature is regulated. The heat thinning effect is greatest for Newtonian fluids where the viscous dissipation and the local temperature are highest at the tip of the blades. Where comparison is possible, very good agreement is found between the numerical results and the available data. Aspects of scraped surface heat exchanger design are assessed in the light of the results.

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Published date: 2004

Identifiers

Local EPrints ID: 29135
URI: http://eprints.soton.ac.uk/id/eprint/29135
ISSN: 0045-7930
PURE UUID: af659557-bfbd-42f8-b080-e3de44ba3250

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Date deposited: 11 May 2006
Last modified: 08 Jan 2022 06:53

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Contributors

Author: K-H. Sun
Author: D.L. Pyle
Author: A.D. Fitt
Author: C.P. Please
Author: M.J. Baines
Author: N. Hall-Taylor

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