Numerical study of forced convection heat transfer across a cylinder with various cross sections

Janjua, Muhammad Mansoor; Khan, Najeeb Ullah; Khan, Waqar Ahmed; Khan, Waseem S.; Ali, Hafız Muhammad

doi:10.1007/s10973-020-10297-7

Cited by 15 publications

(3 citation statements)

References 25 publications

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“…Maleki et al [6] analyzed the infuence of heat source/sink parameters for the boundary layer twodimensional fow of nanofuid along a moving plate under the consideration of viscous dissipation. Some literature regarding boundary layer fow can be seen through the references [7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Entropy Generation and Regression Analysis of Magnetohydrodynamic Stagnation Point Flow of a Casson Fluid with Radiative and Dissipative Heat Transfer and Hall Effects

Prashu

Nandkeolyar

Kumar

et al. 2023

Mathematical Problems in Engineering

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The phenomenon of heat transfer is prevalent in industries and has an extensive range of applications. However, mostly the discussion of heat transfer problems is limited to the study of the first law of thermodynamics, which deals with energy conservation. It is just restricted to the quantity of energy, not to its quality; i.e., there is no difference between the work (high-grade energy) and the heat (low-grade energy). A measurement of the degree of randomness of energy in a system is known as entropy. It is unavailable for doing useful work because work takes place only from ordered molecular motion. Even though many boundary layer models exist in the literature to investigate the flow and heat transfer of various fluids along a stretching surface, they have not yet been used at their maximum ability. The main motive of the current research is to discuss entropy generation or its minimization during heat transfer. This work presents an entropy generation analysis for the transient three-dimensional stagnation point flow of a hydromagnetic Casson fluid flowing over a stretching surface in the existence of Hall current, viscous dissipation, and nonlinear radiation. The physical configuration of the present work is described in terms of partial differential equations (PDEs) of nonlinear nature. Furthermore, these PDEs are converted into ordinary differential equations by using some relevant similarity transformations. An efficient numerical method named as the spectral quasilinearization method (SQLM) is used to solve this model. The expression of the Bejan number and volumetric entropy generation rate is also computed. A parametric analysis, including the essential physical parameters, is performed to examine the influences of distinct flow parameters on the velocity profile, temperature profile, Bejan number, entropy generation number, and the coefficients of skin friction and the Nusselt number. In order to further insight into the emerging physical quantities of engineering interest, multiple quadratic regression models are used to estimate the coefficients of skin friction and heat transfer.

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Section: Introductionmentioning

confidence: 99%

Entropy Generation and Regression Analysis of Magnetohydrodynamic Stagnation Point Flow of a Casson Fluid with Radiative and Dissipative Heat Transfer and Hall Effects

Prashu

Nandkeolyar

Kumar

et al. 2023

Mathematical Problems in Engineering

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“…Kaprawi et al [14] experimented with the entry length of the triangle channel of nanofluid flow with constant heat flux to know the heat transfer performance. For the flow across the cylinders [15], Janjua et al [15] explored the forced convection heat transfer from the cylinder with various cross-sections. Generally, the forced heat transfer from the cylinders, the Nusselt number increases with increasing Reynolds number.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Convective Heat Transfer From Tubes With Various Cross-Section

et al. 2022

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In heat transfer engineering, most of the tubes of the circular cross-section are used in the heat exchanger application, but the possibilities of using tubes other than circular type are available to enhance the rate of heat transfer. This experimental study presents the heat transfer rate performance of the tubes' difference cross-section; circular, elliptic, square, and triangle tubes. The tubes were heated at uniform heat flux at the outside surface, and the water flowed inside the tubes. The important parameters were measured during the experimentation. The results show that the heat transfer varies with the cross-section type. The triangle and elliptical tube give a higher heat transfer rate than other cross-sections.

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“…The heat transfer coefficients increased with the rise of the tubes ellipticities, in particular, they obtained an increase of 34% for the elliptical tube with the largest ellipticity of 0.86. Janjua et al [26] studied, with the use of the software Fluent, the thermal behavior of isothermal horizontal cylinder with different cross sections: circular, elliptical, square, rectangular, hexagonal and triangular. They considered different angles of attack (from 0° to 90°) for elliptic cross section.…”

Section: Introductionmentioning

confidence: 99%

Experimental performance comparison between circular and elliptical tubes in evaporative condensers

Starace

Falcicchia

Panico

et al. 2021

J Therm Anal Calorim

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In refrigeration systems, evaporative condensers have two main advantages compared to other condensation heat exchangers: They operate at lower condensation temperature than traditional air-cooled condensers and require a lower quantity of water and pumping power compared to evaporative towers. The heat and mass transfer that occur on tube batteries are difficult to study. The aim of this work is to apply an experimental approach to investigate the performance of an evaporative condenser on a reduced scale by means of a test bench, consisting of a transparent duct with a rectangular test section in which electric heaters, inside elliptical pipes (major axis 32 mm, minor axis 23 mm), simulate the presence of the refrigerant during condensation. By keeping the water conditions fixed and constant, the operating conditions of the air and the inclination of the heat transfer geometry were varied, and this allowed to carry out a sensitivity analysis, depending on some of the main parameters that influence the thermo-fluid dynamic phenomena, as well as a performance comparison. The results showed that the heat transfer increases with the tube surface exposed directly to the air as a result of the increase in their inclination, that has been varied in the range 0–20°. For the investigated conditions, the average increase, resulting by the inclination, is 28%.

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Numerical study of forced convection heat transfer across a cylinder with various cross sections

Cited by 15 publications

References 25 publications

Entropy Generation and Regression Analysis of Magnetohydrodynamic Stagnation Point Flow of a Casson Fluid with Radiative and Dissipative Heat Transfer and Hall Effects

Entropy Generation and Regression Analysis of Magnetohydrodynamic Stagnation Point Flow of a Casson Fluid with Radiative and Dissipative Heat Transfer and Hall Effects

Experimental Study of the Convective Heat Transfer From Tubes With Various Cross-Section

Experimental performance comparison between circular and elliptical tubes in evaporative condensers

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