A techno-economic investigation of 2D and 3D configurations of fins and their effects on heat sink efficiency of MHD hybrid nanofluid with slip and non-slip flow
TL;DR: In this paper, the effects of fin's length and different types of heat sinks with various lengths on the entropy generation rate (EGR) and Nusselt number (Nu) were investigated at different Richardson numbers (Ri) considering slip and non-slip conditions.
About: This article is published in International Journal of Mechanical Sciences.The article was published on 2021-01-01. It has received 111 citations till now. The article focuses on the topics: Nusselt number & Natural convection.
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TL;DR: In this paper, the impacts of nonlinear thermal radiations on S W C N T − T i O 2 & M W C n T − C o F e 2 O 4 nanoparticles suspended in water-based hybrid type nanofluid flow over rotating disk are considered.
85 citations
19 Aug 2020
TL;DR: A review of recent natural convection studies can be found in this article, where the authors classified the articles based on effective parameters such as magnetic forces, fin, porous media and cavity angles.
Abstract: Natural convection in cavities is an interesting subject for many researchers Especially, in recent years, the number of articles written in this regard has grown enormously This work provides a review of recent natural convection studies At first, experimental studies were reviewed and, then, numerical studies were examined Then, the articles were classified based on effective parameters In each section, numerical studies were examined the parameters added to the cavity such as magnetic forces, fin, porous media and cavity angles Moreover, studies on non-rectangular cavities were investigated Free convection in enclosures depends more on the fluid velocity relative to the forced convection, leading to the opposite effect of some parameters that should essentially enhance rate of heat transfer Nanoparticle addition, magnetic fields, fins, and porous media may increase forced convection However, they can reduce free convection due to the reduction in fluid velocity Thus, these parameters need more precision and sometimes need the optimization of effective parameters
80 citations
TL;DR: In this paper, a generalized non-Newtonian nanofluid model containing the gyrotactic microorganisms was proposed to analyze the applications of porous space and inertial forces by employing the Darcy-Forchheimer relations.
Abstract: With growing development in nano-technology and thermal engineering, nano-materials has intended a great interest of researchers in current decade due to their multidisciplinary significances in renewable energy systems, heating processes, industrial cooling circuits, hybrid-powered motors, solar systems, nanoelectronic, sensing and imaging, coating integrity, drug delivery , nuclear cooling systems etc. The study of nanofluids in presence of external thermal sources like thermal radiation, magnetic force, activation energy and heat source/sink is more effective to improve the heat and mass transportation mechanism. Following to such motivations in mind, current research concern with the bioconvection flow of Sisko nanofluid confined by a stretched surface subject to the bioconvection phenomenon. The applications of porous space and inertial forces are analyzed by employing the Darcy-Forchheimer relations. The modified Cattaneo-Christov relations are utilized to modify the heat and mass equations. The analysis is performed in presence of heat source/sink, activation energy and thermal radiation. The primarily cause and objective of this analysis to suggest more effective and generalized non-Newtonian nanofluid model containing the gyrotactic microorganisms. The developed system of equations are solved numerically by using the bvp4c shooting scheme by using MATLAB software. It is noticed that velocity profile increases with Sisko fluid parameter while it diminishes with local inertia coefficient and bioconvection Rayleigh number. An improve nanofluid temperature is observed with temperature ratio constant and Biot number. A lower nanofluid concentration is resulted due to higher values of Cattaneo-Christov mass flux constant and mixed convection parameter.
48 citations
TL;DR: In this paper , the cooling system of a two-dimensional lithium-ion battery pack with 9 battery cells is simulated and the amount of pressure drop and temperature of cooling system is assessed.
Abstract: In this paper, the cooling system of a two-dimensional lithium-ion battery pack with 9 battery cells is simulated. The airflow at the Reynolds number range from 80 to 140 flows through the cooling system. In this analysis, the temperature of all 9 battery cells is examined separately. The amount of pressure drop and temperature of the cooling system is assessed. Another geometry variable is the size of the inlets and outlets, which are changed simultaneously between 0.1 and 0.2. The finite element method is used for the simulations. The findings suggest that increasing the Reynolds number lowers the battery pack's maximum temperature. At a Reynolds number of 80, increasing the input temperature raises the maximum temperature of all the battery cells except the one in the battery. In model 6, this increase has increased the maximum temperature by more than 40%. Increasing the intake size raises the maximum temperature of all battery cells at other Reynolds numbers. The battery cell located at the inlet has the minimum, and the battery cell located at the outlet side has the maximum temperature. An enhancement in the Reynolds number and inlet size intensifies the pressure drop in the cooling system.
43 citations
TL;DR: In this article, a micro-heat sink (MHS) with zigzag micro-channels subjected to constant heat flux is investigated, and the effective parameters on the thermal hydraulic and irreversibility are investigated.
35 citations
References
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TL;DR: In this paper, an expression for the viscosity of solutions and suspensions of finite concentration is derived by considering the effect of the addition of one solute-molecule to an existing solution, which is considered as a continuous medium.
Abstract: An expression for the viscosity of solutions and suspensions of finite concentration is derived by considering the effect of the addition of one solute‐molecule to an existing solution, which is considered as a continuous medium.
3,724 citations
TL;DR: In this article, the authors present a new analysis of the Couette geometry that requires only two measurements rather than the three used by Mooney, and demonstrate the experimental data on a clay suspension and oil-in-water emulsion.
Abstract: Often for slurries, gels, emulsions, and foams inhomogeneous fluid properties at solid boundaries create “apparent wall slip.” The reduced fluid viscosity at the boundary creates a thin layer of fluid having a large velocity gradient that can be treated as a “slipping layer”. In measurements of fluid viscosity it is necessary to correct for wall slip to determine the true deformation experienced by the bulk of the sample and the true viscosity. The classic earlier techniques for capillaries and Couette geometries were first presented by Mooney. We present a new analysis of the Couette geometry that requires only two measurements rather than the three used by Mooney. We also present a new analysis for flow between rotating parallel disks. The parallel disk geometry has several experimental advantages for measuring fluid viscosities in the presence of wall slip. The analysis of experimental data on a clay suspension and oil‐in‐water emulsion are presented to demonstrate these new techniques.
494 citations
TL;DR: In this paper, the authors provide a comprehensive review on thermal conductivity of hybrid nanofluids by overviewing experimental, numerical and ANN (artificial neural networking) studies, and various factors such as nanoparticle type, concentration of nanoparticles, types of base fluid, size of nanoparticle, temperature, addition of surfactant, pH variation and sonication time are analyzed.
437 citations
TL;DR: In this paper, a review on application of nanofluids in heat exchangers has been addressed, and it can be concluded that the use of nanophotonics in most cases improves heat transfer, which reduces the volume of heat exchanger, saving energy, consequently water consumption and industrial waste.
325 citations