Effects of Air Velocity, Air Gap Thickness and Configuration on Heat Transfer of a Wearable Convective Cooling System

Sun, Yu; Jasper, Warren J.; DenHartog, Emiel

doi:10.4172/2165-8064.1000227

Cited by 1 publication

(1 citation statement)

References 22 publications

(49 reference statements)

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“…To magnify the heat transfer in the rectangular heat exchanger fitted with the circular tubes several fluid dynamics factors are utilized for example pressure drop, flow speed of the particles, different shapes of the geometry, obstacles of regular boundaries and curved shape, different types of flow (laminar or turbulent), different materials of fluid, etc. It is also reasonable to say that convective process, which depends on the heat transfer coefficient possesses, has a direct relationship with the fluid velocity [4][5][6][7]. In the cases when flow is examined through turbulence, velocity of the fluid remains increased due to the addition of kinetic energy of the fluid with dissipation rates [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Simulation of Non-Isothermal Turbulent Flows Through Circular Rings of Steel

Memon¹,

Memon²,

Bhatti³

et al. 2022

Computers, Materials &Amp; Continua

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This article is intended to examine the fluid flow patterns and heat transfer in a rectangular channel embedded with three semi-circular cylinders comprised of steel at the boundaries. Such an organization is used to generate the heat exchangers with tube and shell because of the production of more turbulence due to zigzag path which is in favor of rapid heat transformation. Because of little maintenance, the heat exchanger of such type is extensively used. Here, we generate simulation of flow and heat transfer using nonisothermal flow interface in the Comsol multiphysics 5.4 which executes the Reynolds averaged Navier stokes equation (RANS) model of the turbulent flow together with heat equation. Simulation is tested with Prandtl number (Pr = 0.7) with inlet velocity magnitude in the range from 1 to 2 m/sec which generates the Reynolds number in the range of 2.2 × 10 5 to 4.4 × 10 5 with turbulence kinetic energy and the dissipation rate in ranges (3.75 × 10 −3 to 1.5 × 10 −2 ) and (3.73 × 10 −3 −3 × 10 −2 ) respectively. Two correlations available in the literature are used in order to check validity. The results are displayed through streamlines, surface plots, contour plots, isothermal lines, and graphs. It is concluded that by retaining such an arrangement a quick distribution of the temperature over the domain can be seen and also the velocity magnitude is increasing from 333.15% to a maximum of 514%. The temperature at the middle shows the consistency in value but declines immediately at the end. This process becomes faster with the decrease in inlet velocity magnitude.

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