Heat and fluid flow characteristics of a rectangular channel with a small diameter circular cylinder as vortex generator

Wang, Jiansheng; Zhao, Yunjian

doi:10.1016/j.ijthermalsci.2015.01.018

Cited by 31 publications

(9 citation statements)

References 33 publications

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“…Furthermore, a modified channel having cylindrical vortex generators inside a uniform channel using turbulent flow with a Reynolds number of 3745 has been investigated numerically [43]. It was found that using a cylindrical vortex generator enhanced the heat transfer by 1.18 times compared to the uniform channel.…”

Section: Introductionmentioning

confidence: 99%

Assessment of vortex generator shapes and pin fin perforations for enhancing water-based heat sink performance

Al-Asadi

Al‐damook

Wilson

2018

International Communications in Heat and Mass Transfer

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In this study, two models have been analysed numerically to examine the impact of the geometry and the working fluid under laminar flow on heat and flow characteristics. The first model is a perforated pinned heat sink (PPHS) and the second is a new design of a uniform micro-channel having different shapes of vortex generators (VGs) positioned at intervals along the base of the channel. The VG shapes are circular, triangular and rectangular, and are compared to each other based on constant volume. Models with Reynolds number in the range of 50 to 2300 are subjected to a uniform heat flux relevant to microelectronics air and water cooling. Validations against previous micro-channel studies were conducted using the COMSOL Multiphysics software package and found to be in good agreement. The results show that there is no significant enhancement in heat transfer using water in PPFHS. However, the VGs described here are shown to offer significant potential in combatting the challenges of heat transfer in the technological drive toward lower weight/smaller volume electrical and electronic devices. It is also found that the circular VGs offer the best heat performance among the proposed shapes.

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Section: Introductionmentioning

confidence: 99%

Assessment of vortex generator shapes and pin fin perforations for enhancing water-based heat sink performance

Al-Asadi

Al‐damook

Wilson

2018

International Communications in Heat and Mass Transfer

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“…It was demonstrated that the interaction between the cold fluid flowing to the wall and the hot fluid flowing out of the wall is the main reason for the difference between heat transfer and momentum transfer. Wang et al [10] demonstrated that the variation of turbulent boundary layer and the heat transfer performance is significantly related to the interaction between the cylinder and the wall boundary layer through large eddy simulation (LES).…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Gap Ratio on the Flow and Heat Transfer over a Bluff Body in Near-Wall Conditions

Zhai¹,

Xi²

2022

Fluid Dynamics &Amp; Materials Processing

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“…At present, the researches of the flow around the near wall cylinder mainly focus on the flow characteristics, [4][5][6][7][8][9] while few on heat transfer enhancement, and the flow states mainly focus on laminar flow and turbulent flow. 1,[10][11][12][13][14] Fujita et al 10 experimentally investigated the flow around a circular cylinder with different diameters from 3 mm to 5 mm, 8 mm and 10 mm, and with the clearance ratio ranged from 0 to 4.0 under Reynolds number of 7000. The distribution of the local average velocity, static pressure and wall heat transfer coefficient (HTC) along the wall were obtained.…”

Section: Introductionmentioning

confidence: 99%

“…It was found that the main reason for the difference of heat transfer and momentum transfer was the interaction of the cold fluid flowing to the wall and the hot fluid flowing out of the wall. Wang and Zhao 12 numerically investigated the small-size cylinder as a vortex generator inserted into the fully developed turbulent boundary layer. The results showed the mutual effect between the cylinder wake and the wall boundary layer could significantly alter the flow structure of the turbulent boundary layer, leading to heat transfer enhancement.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer enhancement of wall with a near wall cylinder in a channel at low and middle Reynolds number ranges

Cai

2020

Measurement and Control

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This paper investigated the flow performance around a near-wall cylinder and its effect on heat transfer enhancement in the laminar and early transitional flow region. The numerical model is resolved by finite volume method through FORTRAN code. The results show that the flow field becomes a transitional flow state when Re = 100 due to the insertion of a cylinder. In the transitional flow sate, the heat transfer enhancement is regional, mainly concentrating in the region of –2 ≤ x/D≤ 10, and the region increases with the increase of Re; There are three or four peaks in the distribution of instantaneous local Nusselt number. The first peak is caused by the acceleration of the fluid between the cylinder and the bottom wall. The other peaks are caused by the interaction between the cylinder wake and the bottom wall boundary layer. The vortical structure induced by the periodic instability of the fluid in the transitional flow is the main factor for explaining the local heat transfer enhancement of the cylinder downstream wall. Re has a direct impact on the vortical structure in the flow field. The greater Re, the greater the heat transfer enhancement of the cylinder downstream wall. Under the same blocking ratio of D/H, the greater Re, the smaller the optimal clearance ratio of C/D. The guidelines are suggested for the design on heat dissipation of electronic equipment.

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Heat and fluid flow characteristics of a rectangular channel with a small diameter circular cylinder as vortex generator

Cited by 31 publications

References 33 publications

Assessment of vortex generator shapes and pin fin perforations for enhancing water-based heat sink performance

Assessment of vortex generator shapes and pin fin perforations for enhancing water-based heat sink performance

The Effect of the Gap Ratio on the Flow and Heat Transfer over a Bluff Body in Near-Wall Conditions

Heat transfer enhancement of wall with a near wall cylinder in a channel at low and middle Reynolds number ranges

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