Abstract
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 non-isothermal 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 × 105 to 4.4 × 105 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.
Highlights
The implication of the circular rings or cylinders in the channel of any shape to execute the efficient heat exchanger is extensively used in the field of engineering, science and industry where the improvement of the heat transfer or heat energy is important or beneficial [1,2,3]
The current fluid flow problem along with heat distribution is checked by using the turbulent κ − ε model of Reynolds averaged Navier Stokes equations in combination with heat equation for the rectangular domain outfitted with the three semi-circular cylinders comprised of steel at the boundaries of the channel
The inlet velocity magnitude of the channel is assumed in the range from 1–2 m/sec with intervals of 0.1
Summary
The implication of the circular rings or cylinders in the channel of any shape to execute the efficient heat exchanger is extensively used in the field of engineering, science and industry where the improvement of the heat transfer or heat energy is important or beneficial [1,2,3]. Due to the turbulence the amount of airflow as well as the blare of the flow are enhanced which stimulates the heat conduction and thermal collaboration. This indicates to control the heat transfer to make the efficient rectangular heat exchanger, the turbulence modeling in the channel plays a vital role [11,12,13]. Along with the turbulence modeling the making of the heat exchanger with the air as testing fluid with addition of the non-isothermal flow properties carries a lot of importance in numerous applications like making coolant apartments, maintaining the residential heat up, producing ventilated air conditioning rooms, solar collectors, production of the turbine blades running through gaseous, etc. Because of having variety of applications in civil, electrical, and mechanical engineering, different scientists and researchers have put their energy to study (numerically and experimentally) the heat transfer enhancement of the physical problems
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