Technical Brief

Effect of the Asymmetric Baffle Shape on the Thermal Performance Using Non-Newtonian Fluids

[+] Author and Article Information
Mohsen Rostam

Department of Chemical Engineering,
Faculty of Engineering,
University of Mazandaran,
Babolsar Post Box. 416, Iran

Elham Omidbakhsh Amiri

Department of Chemical Engineering,
Faculty of Engineering,
University of Mazandaran,
Babolsar Post Box. 416, Iran
e-mail: e.omidbakhsh@umz.ac.ir

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received April 1, 2018; final manuscript received August 12, 2018; published online September 25, 2018. Assoc. Editor: Yuwen Zhang.

J. Heat Transfer 140(12), 124503 (Sep 25, 2018) (4 pages) Paper No: HT-18-1192; doi: 10.1115/1.4041324 History: Received April 01, 2018; Revised August 12, 2018

The efficiency of industrial heat equipment can be increased using baffles. The shape of baffles is one of the effective parameters. In this work, the effect of shapes of asymmetric baffles on the thermal performance has been investigated. Four different shapes as rectangular diagonal, trapezoidal, triangular and semi-ellipsoid, as well as, vertical rectangle (as the base model) were used. Also, four non-Newtonian fluids were used as the working fluid. The governing equation, which models the physical phenomenon, was solved with the finite volume method. The results showed that better thermal performance could be observed with semi-ellipsoid baffle for all four non-Newtonian fluids. However, for different models of non-Newtonian fluids, the average of increasing of thermal performance with different percent was achieved. By comparing different models of non-Newtonian fluids, shear-thinning model shows better thermal performance than other models.

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Fig. 1

(a) Schematic of the channel geometry with rectangular baffles, (b) rectangular baffles, (c) rectangular diagonal baffles, (d) trapezoidal baffles, (e) triangular baffles, and (f) semi-ellipsoid baffles

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Fig. 2

Viscosity versus shear rate for different non-Newtonian fluids

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Fig. 3

Validation of the model [4]

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Fig. 4

Variations of β versus mass flow rates using the power law model, n < 1

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Fig. 5

Variations of β versus mass flow rates using the power law model, n > 1

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Fig. 6

Variations of β versus mass flow rates using the shear-thinning model

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Fig. 7

Variations of β versus mass flow rates using the shear-thickening model

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Fig. 8

Variations of β versus mass flow rates using four different models of non-Newtonian fluids with semi-ellipsoid baffle



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