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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/1829
Title: Analysis of laminar flow across a triangular periodic array of heated cylinders
Authors: Asif M.
Dhiman, Amit Kumar
Published in: Journal of the Brazilian Society of Mechanical Sciences and Engineering
Abstract: The laminar flow and heat transfer across a triangular periodic array of heated cylinders are simulated computationally and analyzed. The study has been carried out at Reynolds number 10–100 for fluid volume fraction ranging from 0.7 to 0.99 and Prandtl number ranging from 0.7 to 50. The size of the wake region increases continuously with an increase in the Reynolds number for all values of fluid volume fraction. The recirculation bubble from the rear of a cylinder is reaching the front of the next cylinder in the same column of the periodic array for low values of free volume fraction, but this is not the case with the highest free volume fraction, i.e., 0.99. At high Reynolds number, the flow is separating early on the cylinder surfaces. The wake size at higher Reynolds number 75 and 100 for the lowest free volume fraction 0.7 is more in comparison with the wake size at free volume fraction 0.99, which is explained by plotting the location of flow separation against Reynolds number for both the extreme values of free volume fractions, i.e., 0.7 and 0.99. The isovorticity contours are concentrated in the vicinity of the cylinders on increasing the Reynolds number irrespective of free volume fraction and then convected downstream. On increasing free volume fraction, the friction and pressure drags in the array decrease. The increase in Reynolds number also results in the decrease in the values of the individual (friction and pressure drag coefficients) as well as total drag coefficients for all values of free volume fraction. At high values of Reynolds number, the emergence of carbuncle or thermal spike on isotherm near the cylinder’s surface is observed where the value of the local Nusselt number is observed low. The heat transfer improves and the Nusselt number increases as the Reynolds number and/or Prandtl number increases. On the contrary, heat transfer decreases as free volume fraction increases. © 2018, The Brazilian Society of Mechanical Sciences and Engineering.
Citation: Journal of the Brazilian Society of Mechanical Sciences and Engineering (2018), 40(7): -
URI: https://doi.org/10.1007/s40430-018-1273-7
http://repository.iitr.ac.in/handle/123456789/1829
Issue Date: 2018
Publisher: Springer Verlag
Keywords: Cylinders
Drag coefficient
Flow separation
Free volume fraction
Isotherms
Nusselt number
Periodicity
Triangular array
ISSN: 16785878
Author Scopus IDs: 57206481755
8548369300
Author Affiliations: Asif, M., Chemical Engineering Department, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Dhiman, A., Chemical Engineering Department, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Corresponding Author: Dhiman, A.; Chemical Engineering Department, Indian Institute of Technology RoorkeeIndia; email: dhimuamit@rediffmail.com
Appears in Collections:Journal Publications [CH]

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