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Research Papers

Effect of Dimple Intrusions and Curvature Radius of Rounded Corner Triangular Duct on Fluid Flow and Heat Transfer

[+] Author and Article Information
Rajneesh Kumar

National Institute of Technology,
Mechanical Engineering Department,
Hamirpur 177005, H.P., India
e-mail: rajneesh127.nith@gmail.com

Sourabh Khurana

Om Institute of Technology and Management,
Mechanical Engineering Department,
Hisar 125005, HR, India
e-mail: sourabhkhurana2@gmail.com

Anoop Kumar

Professor
National Institute of Technology,
Mechanical Engineering Department,
Hamirpur 177005, H.P., India
e-mail: anoop@nith.ac.in

Varun Goel

Mem. ASME
National Institute of Technology,
Mechanical Engineering Department,
Hamirpur 177005, H.P., India
e-mail: varun7go@gmail.com

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received March 4, 2018; final manuscript received September 26, 2018; published online January 25, 2019. Assoc. Editor: Sandip Mazumder.

J. Thermal Sci. Eng. Appl 11(3), 031001 (Jan 25, 2019) (11 pages) Paper No: TSEA-18-1115; doi: 10.1115/1.4041683 History: Received March 04, 2018; Revised September 26, 2018

The sharp corner significantly affects the flow through triangular duct. In the corners, flow gets stagnant, which results in poor heat transfer. Therefore, in the present study, one corner of the duct is kept rounded with variable curvature radius values (Rc). The curvature radius is selected in such a way that it varied from the minimum value (i.e., Rc = 0.33 times duct height; h) to a maximum value (i.e., Rc = 0.67h,which named as conventional duct in the work). In addition to this, the combined effect of both rounded corner and dimple-shaped intrusion has also been studied on flow of air and heat transfer and for this purpose; the relative streamwise distance (z/e) is varied from 6 to 14 with constant relative transverse distance (x/e) that is10. Steady-state, turbulent flow heat transfer under thermal boundary conditions is analyzed for Reynolds number from 5600 to 17,700. ANSYS (Fluent) 12.1 software is used to perform numerical simulations and good match has been observed between the simulated and experimental results. Due to rounded corner and dimple intrusions, velocity near the corner region has higher value in comparison to the conventional duct. The uniform temperature distribution is seen in the case of dimple intruded duct as compared to conventional and rounded corner duct (with Rc value of 0.33h). In comparison to conventional duct, the heat transfer increased about 21–25%, 13–20%, and 5–8%, for the Rc value of 0.33h, 0.49h, and 0.57h, respectively, but the combination of rounded corner and dimple-shaped intrusion augments heat transfer by 46–94%, 75–127%, 60–110%, for the z/e value of 6, 10, and 14, respectively, with the Reynolds number increase from 5600 to 17,700.

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Figures

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Fig. 1

(a) Detailed view of roughened heated surface and (b) Schematic view of dimple protrusion and electric heater

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Fig. 2

Layout of experimental setup (a) layout of experimental setup and (b) constructional details of designed duct

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Fig. 3

(a) Heater with series and parallel loops of heating element over the of asbestos sheet and (b) location of twelve thermocouples on conducting side

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Fig. 5

Implementation of symmetric boundary condition

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Fig. 6

Pictorial view of meshed duct

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Fig. 4

Pictorial view of dimple shaped intrusions on conducting side

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Fig. 7

Variation of Tcs in different ducts with Re

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Fig. 8

Transverse variation of velocity inside the duct at z/ltest of 0.7

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Fig. 12

Variation of f with Re for different Rc values

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Fig. 9

Variation of average Nu with Re for different Rc value

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Fig. 10

Variation of velocity profile with the change of Rc

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Fig. 11

Local temperature variation at dimensional distance (z/ltest = 0.7)

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Fig. 13

Change of Nuavg with Re for different z/e values

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Fig. 14

Streamline plots for different value of z/e

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Fig. 15

Change of f with Re for different z/e values

Tables

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