Analysis of unsteady heat transfer of specific longitudinal fins with Temperature-dependent thermal coefficients by DTM

Pasha, Azeem; Jalili, Payam; Ganji, D.D.

doi:10.1016/j.aej.2017.11.019

Cited by 32 publications

(6 citation statements)

References 61 publications

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“…The total numbers of our constants are 30 (according to Eqs 25-29), and we have 12 equations according to Eq 31, so we require 28 more equations. We provide 28 equations by substitution Eqs (25)(26)(27)(28)(29) in main Eqs (13)(14)(15)(16)(17). Now we can suppose five basic equations (Eqs 13-17) as D1 to D5, respectively, and use boundary conditions and their derivation to get Eqs as fallow:…”

Section: Application Of (Agm)mentioning

confidence: 99%

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A novel analytical approach to micro-polar nanofluid thermal analysis in the presence of thermophoresis, Brownian motion and Hall currents

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The present study analyzed micro-polar nanofluid in a rotating system between two parallel plates with electric and magnetic fields. The fluid flow study was performed in a steady state. The governing equations of the present issue are considered coupled and nonlinear equations with proper similar variables. Numerical and new semi-analytical methods have been employed to solve the problem to define the exactness of the results. The influence of physical parameters governing the problem is investigated and illustrated in detail in the diagram. Results show that velocity profile and micro-rotation velocity increased when the magnetic parameter increased. Furthermore, the velocity is increased by increasing the rotation parameter. Also, in the case of the temperature profile, the Reynolds and Schmidt number has an inverse effect, and Prandtl Number and Brownian motion have a direct effect. Other results indicate that concentration value declines by increasing the Thermophoretic parameter and Reynolds number. Results compare to the prior research display good accuracy and efficiency.

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Section: Application Of (Agm)mentioning

confidence: 99%

“…They explained the effect of nanoparticles in the enhancement of heat transfer. Researchers have used semianalytical techniques to solve many engineering problems in investigating heat transfer [17][18][19][20][21][22][23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

A novel analytical approach to micro-polar nanofluid thermal analysis in the presence of thermophoresis, Brownian motion and Hall currents

et al. 2022

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“…Also, much research on heat transfer problems in different geometries has been performed analytically and numerically. In many of these researches, fluid temperature parameters have been measured [21][22][23][24][25][26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Squeezing flow of Casson fluid between two circular plates under the impact of solar radiation

et al. 2023

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The transient squeezing flow of 2D Magnetohydrodynamics (MHD) considering Casson fluid in the existence of solar irradiance is clarified numerically and theoretically. Generally, to minimize the energy utilized in the solar unit, we must track the heat and mass transition procedure in the solar irradiance process. In this issue, we assumed the dynamic of mass and heat diffusivity as the function of temperature. The employed model, which is run by the (Partial Differential Equations) PDEs system, manages by the Similarity method and the MATLAB bvp4c package. As can be obtained, the validation of numerical outcomes plays approvingly whenever collated with the previous literature. Eventually, the following investigations are performed. It is indicated that the presence of squeezed numbers plays a crucial role, and an increase in the squeezing factor boosts the temperature of non-Newtonian fluid about 20%. Also, the higher quantities of floating viscosity remarkably affect skin friction. Also, an increment in the chemical reaction rate diminishes the mass concentration profile. Besides, an increase in Pr number from 0.1 to 1.5 leads to a 1% increase in dimensionless temperature 𝜃(𝜂) and a decrease in Nr from 1 to 0.01 and in squeezing parameter cause to 5% and 17% enhancement in 𝜃(𝜂). Regarding the Schmitt number of 0.7 and the 𝜁 3 of 0.3, the skin friction increases up to one. Furthermore, at the higher quantities of thermal conductivity, the Ec number boosts the 20% fluid flow temperature profile within the squeezing channel.

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“…Further, it was concluded that the fin surface temperature rises with an increase in heat generation. The transient response of distinct profiles of the longitudinal fin was investigated by Pasha et al 7 by employing the semianalytical method of differential transformation. Sowmya et al 8 scrutinized the porous fin problem in the presence of fully wet conditions.…”

Section: Introductionmentioning

confidence: 99%

Transient thermal investigation of a fully wet porous convective–radiative rough cylindrical pin fin

2023

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The microelectromechanical systems technologies frequently produce rough surfaces, and the repercussion of roughness on the thermal performance is more prominent in structures of smaller dimensions. In this regard, the present article intends to examine the unsteady thermal behavior of a fully wet, porous, and rough micropin‐fin structure under convective–radiative conditions. Here, a pin fin of a cylindrical profile has been chosen. The problem is modeled by incorporating the roughness parameters in the perimeter and cross‐sectional area of the pin fin. Further, the study of the porous structure has been carried out by implementing the Darcy model. The resulting partial differential equation is nonlinear and of the second order which has been solved by employing the finite difference method. The impact of the roughness parameter, wet porous parameter, dimensionless time, convective parameter, base radius‐to‐length ratio, radiative parameter, thermal conductivity parameter, power index, and ambient temperature on the thermal performance and efficiency of rough micropin‐fin structures has been established graphically. According to the findings, for 0.15% $0.15 \% $ rise in roughness, the rough micropin fin has 12% $12 \% $ more thermal drop rate and 13% $13 \% $ less efficiency than the smooth one. Further, the work is beneficial in the field of microelectronics, especially in the design of micropin‐fin structures.

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Analysis of unsteady heat transfer of specific longitudinal fins with Temperature-dependent thermal coefficients by DTM

Cited by 32 publications

References 61 publications

A novel analytical approach to micro-polar nanofluid thermal analysis in the presence of thermophoresis, Brownian motion and Hall currents

A novel analytical approach to micro-polar nanofluid thermal analysis in the presence of thermophoresis, Brownian motion and Hall currents

Squeezing flow of Casson fluid between two circular plates under the impact of solar radiation

Transient thermal investigation of a fully wet porous convective–radiative rough cylindrical pin fin

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