scholarly journals Simulation-based Study of Graphene-water Nanofluid flow through Microchannel Heatsink

2021 ◽  
Vol 1206 (1) ◽  
pp. 012008
Author(s):  
Ritwik Bhattacharya ◽  
Pranab Samanta
Keyword(s):  
Rectangular Cross Section ◽  
Constant Heat Flux ◽  
Cfd Analysis ◽  
Nanofluid Flow ◽  
Constant Heat ◽  
Ansys Fluent ◽  
Pressure Distributions ◽  
Simulation Based ◽  
Flow Through ◽  
Temperature And Pressure

Abstract This study presents a CFD analysis of the laminar flow of graphene-water nanofluid through a Silicon microchannel heatsink using commercial software ANSYS FLUENT. The microchannel has a rectangular cross-section of given dimensions, and the base of the heatsink is subjected to a constant heat flux. Simulations of the coolant flow are performed at different fluid inlet velocities for nanoparticle concentrations of 0%, 3% and 6% in the base fluid-Water. Results for temperature and pressure distributions in the microchannel heatsink are presented. The cooling performance of the MCHS improves significantly by increasing the flow velocity and enhancing the nanoparticle concentration in the coolant.

Investigation of Non-Newtonian Fluids Flow Behavior in A Double Step Expansion Channel: Part 2

2018 ◽  
pp. 1-10
Author(s):  
Ahmed Ouda ◽  
Khudheyer Mushatet ◽  
Qais Rishack
Keyword(s):  
Flow Behavior ◽  
Constant Heat Flux ◽  
Expansion Ratio ◽  
Reattachment Length ◽  
Double Step ◽  
Constant Heat ◽  
Distance Ratio ◽  
Ansys Fluent ◽  
Flow Through ◽  
Power Law Index

A numerical investigation to study the behavior of the turbulent non-newtonian flow through a channel from two expansions with constant heat flux at the lower wall is calculated. This behavior predicted for Reynolds number from 16000 to 100000 and for the range of power law index from 0.4 to 1.6. The distance ratio between the two expansions is varied from 1 to 6 with expansion ratio from 1.5 to 3 and aspect ratio from 1 to 4. These results are obtained by using ANSYS FLUENT 15.0. The results illustrate the effect of the first expansion on the second expansion and the variation of the reattachment length and Nusselt number. These results gave an idea about the ability of the step distance to control the whole flow structure.

Thermal and Fluid Dynamic Model for Capillary-Driven Heat Pipe With Closed-Form Solution

2017 ◽  
Author(s):  
Jesse Maxwell
Keyword(s):  
Boundary Condition ◽  
Heat Flux ◽  
Closed Form ◽  
Heat Pipe ◽  
Closed Form Solution ◽  
Constant Heat Flux ◽  
Form Solution ◽  
Constant Heat ◽  
Micro Channels ◽  
Flow Through

A model is derived for the steady state performance of capillary-driven heat pipes on the basis treating fluid flow through miniature- and micro-channels and applied as bulk properties to a large aspect ratio quasi-one-dimensional two-phase system. Surface tension provides the driving force based on an equivalent bulk capillary radius while laminar flow through micro-channels and the vapor core are treated. Heat conduction is accounted for radially while isothermal advection is treated along the axis. A closed-form solution is derived for a steady state heat pipe with a constant heat flux boundary condition on the evaporator as well as a constant heat flux or a convective boundary condition along the condenser. Two solution methods are proposed, and the result is compared to empirical data for a copper-water heat pipe. The components of the closed-form solution are discussed as contributors to driving or frictional forces, and the existence of an optimal pore radius is demonstrated.

scholarly journals NUMERICAL INVESTIGATION OF DEVELOPING LAMINAR FLUID FLOW THROUGH RECTANGULAR ANNULUS DUCT

2020 ◽  
Vol 15 (12) ◽  
Author(s):  
Takwah Talib Hasan
Keyword(s):  
Heat Flux ◽  
Nusselt Number ◽  
Fluid Flow ◽  
Average Nusselt Number ◽  
Constant Heat Flux ◽  
Ansys Fluent ◽  
Constant Length ◽  
Laminar Fluid Flow ◽  
Number Increase ◽  
Flow Through

The laminar fluid flow of water through the annulus duct was investigated numerically by ANSYS fluent version 15.0 with height (2.5, 5, 7.5) cm and constant length (L=60cm). With constant heat flux applied to the outer duct. The heat flux at the range (500,1000,1500,2000) w/m2 and Reynolds number values were ≤ 2300. The problem was 2-D investigated. Results revealed that Nusselt number decrease and the wall temperature increase with the increase of heat flux. Also, the average Nusselt number increase as Re increases. And as the height of the annulus increase, the values of the temperature and the local and average Nusselt number increase.

On the reverse transition of a turbulent flow under the action of buoyancy forces

1971 ◽  
Vol 47 (3) ◽  
pp. 503-512 ◽  
Author(s):  
Alejandro Steiner
Keyword(s):  
Boundary Layer ◽  
Constant Heat Flux ◽  
Vertical Pipe ◽  
Constant Heat ◽  
Mean Velocity ◽  
Reverse Transition ◽  
Buoyancy Forces ◽  
Free And Forced Convection ◽  
Flow Through ◽  
Layer Flow

Experiments were conducted in an ascending laminar flow through a vertical pipe under combined free and forced convection at constant heat flux through the wall.Mean velocity and temperature profiles were measured with a hot-wire probe. This velocity profile which is deformed by the buoyancy forces, enabled us to compute the reduced acceleration parameter. The profiles obtained showed that the value of the parameter at which reverse transition takes place is approximately the same as that found in isothermal boundary-layer flow. By measuring the autocorrelation function of the velocity after the reverse transition it was shown that the flow in the boundary layer becomes laminar as well as fluctuating and that it oscillates with a predominating period.

Experimental Investigation and Mathematical Modeling of Clearance Brush Seals

1998 ◽  
Vol 120 (3) ◽  
pp. 573-579 ◽  
Author(s):  
M. T. Turner ◽  
J. W. Chew ◽  
C. A. Long
Keyword(s):  
Radial Pressure ◽  
Experimental Program ◽  
Cfd Analysis ◽  
Axial Pressure ◽  
Pressure Distributions ◽  
Brush Seal ◽  
Flow Through ◽  
Definition Of ◽  
Resistance Coefficients ◽  
Nonlinear Resistance

In this paper, an experimental program and a CFD based mathematical model using a brush seal at two bristle to rotor clearances (0.27 mm and 0.75 mm) are presented. The experimental program examined the radial pressure distributions along the backing ring, the axial pressure distribution along the rotor, and the mass flow through the seal through a range of pressure ratios while exhausting to atmosphere. The results from this experimental program have been used to further calibrate a CFD-based model. This model treats the bristle pack as an axisymmetric, anisotropic porous region, and is calibrated by the definition of nonlinear resistance coefficients in three orthogonal directions. The CFD analysis calculates the aerodynamic forces on the bristles, which are subsequently used in a separate program to estimate the bristle movements, stresses, and bristle and rotor loads. The analysis shows that a brush seal with a build clearance produces a very different flow field within the bristle pack to one with an interference, and the need to understand the bulk movements of the bristles. These are shown to be affected by the level of friction between the bristles and the backing ring, which has an important effect on the bristles wear and seal leakage characteristics.

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