Forced convection heat transfer from an equilateral triangular cylinder at low Reynolds numbers

Chatterjee, Dipankar; Mondal, Bittagopal

doi:10.1007/s00231-012-1006-x

Cited by 26 publications

(3 citation statements)

References 28 publications

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“…Forced convection and fluid-flows over circular cylinder arise in many micro-channels, nuclear. Lots of detailed information exists on the forced convection and fluid-flow past a circular cylinder [10][11][12][13][14][15][16]. Dhiman et al [3] numerically investigated the effect of blockage ratio (B = 1/8, 1/6, 1/4) on the cross flow of power-law fluids over a square cylinder confined in channel for the range of values of the power-law index 0.5 ≤ n ≤ 2, and Reynolds number range 1 ≤ Re ≤ 45.…”

Section: Introductionmentioning

confidence: 99%

Mixed convection in poiseuille fluid from an asymmetrically confined heated circular cylinder

Laidoudi

Bouzit

2018

THERM SCI

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This paper examines the effects of thermal buoyancy on momentum and heat transfer characteristics of symmetrically and asymmetrically confined cylinder submerged in incompressible Poiseuille liquid. The detailed flow and temperature fields are visualized in term of streamlines and isotherm contours. The numerical results have been presented and discussed for the range of conditions as 10 ≤ Re ≤ ≤ 40, Richardson number 0 ≤ Ri ≤ 4, and eccentricity factor 0 ≤ ε ≤ 0.7 at Prandtl number Pr = 1, and blockage ratio B = 20%. The representative streamlines and isotherm patterns are presented to interpret the flow and thermal transport visualization. When the buoyancy is added, it is observed that the flow separation diminishes gradually and at some critical value of the thermal buoyancy parameter it completely disappears resulting a creeping flow. Additionally, it is observed that the down vortex requires more heating in comparison to upper vortex in order to be suppressed. In the range 1.5 ≤ Ri ≤ 4, two counter rotating regions appear above the cylinder and on the down channel wall behind the cylinder. The total drag coefficient, C D , increases with increasing Richardson number at (ε = 0). Moreover, an increase in eccentricity factor from 0 to 0.3 increases C D by 37% at Re = 10, and 30% at Re = 20 for Ri = 4. An increase in eccentricity factor form 0 to 0.4 increases local Nusselt number by 20.4% at Re = 10, and 18.6% at Re = 30 for Ri = 4.

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Section: Introductionmentioning

confidence: 99%

Mixed convection in poiseuille fluid from an asymmetrically confined heated circular cylinder

Laidoudi

Bouzit

2018

THERM SCI

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“…These studies demonstrated heat transfer enhancement and can be conveniently categorized in passive and active techniques [14,15], which either harness flow energy or utilize external source of energy to augment the heat transfer, respectively. The flow past bluff, rigid bodies such as, rectangular cylinder [16], inclined square cylinder [17], triangular cylinder [18], wings [19,20,21] in a channel, conical [22] and louvered strip inserts [23] in a tube, and flow in wavy-wall channel [24] were utilized as a passive technique. On the other hand, the heat transfer improvement via oscillating bluff bodies inside the channel [25,26] was shown as the active technique.…”

Section: Introductionmentioning

confidence: 99%

Flow-induced deformation of a flexible thin structure as manifestation of heat transfer enhancement

Soti

Bhardwaj

Sheridan

2015

International Journal of Heat and Mass Transfer

105

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Flow-induced deformation of thin structures coupled with convective heat transfer has potential applications in energy harvesting and is important for understanding functioning of several biological systems. We numerically demonstrate large-scale flow-induced deformation as an effective passive heat transfer enhancement technique. An in-house, strongly-coupled fluidstructure interaction (FSI) solver is employed in which flow and structure solvers are based on sharp-interface immersed boundary and finite element method, respectively. In the present work, we validate convective heat transfer module of the in-house FSI solver against several benchmark examples of conduction and convective heat transfer including moving structure boundaries. The thermal augmentation is investigated as well as quantified for the flow-induced deformation of an elastic thin plate attached to lee side of a rigid cylinder in a heated channel laminar flow. We show that the wake vortices past the plate sweep higher sources of vorticity generated on the channel walls out into the high velocity regions -promoting the mixing of the fluid. The self-sustained motion of the plate assists in convective mixing, augmenting convection in bulk and near the walls; and thereby reducing thermal boundary layer thickness as well as improving Nusselt number at the channel walls. We quantify the thermal improvement with respect to channel flow without any bluff body and analyze the role of Reynolds number, Prandtl number and material properties of the plate in the thermal augmentation.

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“…Here, the results for flowing fluid across a static sharp cornered equilateral triangular prism are compared with the results obtained by Tu et al [8] for 50≤Re≤150 in terms of CDmean, CLRMS and St where prism is placed in such a way that one of its vertices face the upstream. Furthermore, heat transfer from sharp cornered triangular prism is validated with following expression presented by Chatterjee and Mondal [9], where Nusselt number is expressed in terms of Reynolds number for 50≤Re≤150 and Pr=6.9.…”

Section: Validation Of Numerical Modelmentioning

confidence: 99%

Effect of Corner Modification on Forced Convection and Properties of Flowing Fluid Past Static Equilateral Triangular Prism at Various Reynolds Numbers

Ashfaq,

Manzoor

2023

MATEC Web Conf.

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This paper demonstrates the 2D numerical investigation to determine outcome of corner modification on the heat transfer and flow parameters of fluid flowing past static equilateral triangular prism. For this purpose, the corners are modified in such a way that 1/8 of the side length of prism is chamfered and rounded. Prism is placed in incompressible flow in such a way that one of its vertices is facing the upstream. Flow velocity varies as Reynolds number range from 50 to 150 with an increment of 20. Drag and lift coefficients are sensitive to corner profile of prism. At Re of 110, rounding caused a maximum of 6.5% and 12.6% reduction is observed after chamfering the corners of prism. Increasing Re caused Root mean square value of lift coefficient (CLRMS) to increase. At Re of 150, chamfered corners increased the CLRMS by 22.3% whereas rounding enhanced it by 21.6%. Time-averaged streamlines suggested the reduction in the wake width behind the prism with increasing Re and changed corner profile. Forced convective heat transfer from sharp, rounded and chamfered prisms is discussed in terms of time and space averaged Nusselt number which enhanced by 5% after corner modification of prism. Lastly, mean spread of heat transfer coefficient over prisms is presented and discussed.

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Forced convection heat transfer from an equilateral triangular cylinder at low Reynolds numbers

Cited by 26 publications

References 28 publications

Mixed convection in poiseuille fluid from an asymmetrically confined heated circular cylinder

Mixed convection in poiseuille fluid from an asymmetrically confined heated circular cylinder

Flow-induced deformation of a flexible thin structure as manifestation of heat transfer enhancement

Effect of Corner Modification on Forced Convection and Properties of Flowing Fluid Past Static Equilateral Triangular Prism at Various Reynolds Numbers

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