Numerical study on thermal enhancement in hyperbolic tangent fluid with dust and hybrid nanoparticles

2021 ◽  
Vol 127 ◽  
pp. 105535
Author(s):  
M. Nawaz ◽  
Hadi Ali Madkhali ◽  
Maryam Haneef ◽  
Sayer Obaid Alharbi ◽  
M.K. Alaoui
Keyword(s):  
Numerical Study ◽  
Hybrid Nanoparticles ◽  
Hyperbolic Tangent ◽  
Thermal Enhancement

Thermal performance enhancement of flat plate solar air heater using transverse U-shaped turbulator - A numerical study

2019 ◽  
Vol 13 (3) ◽  
pp. 5562-5587 ◽  
Author(s):  
M. S. Manjunath ◽  
R. Venkatesh ◽  
N. Madhwesh
Keyword(s):  
Heat Transfer ◽  
Flat Plate ◽  
Enhancement Factor ◽  
Performance Enhancement ◽  
Numerical Study ◽  
Solar Air Heater ◽  
Air Heater ◽  
Relative Pitch ◽  
Thermal Enhancement ◽  
Thermal Enhancement Factor

The aim of this study is to determine the effect of U-shaped rib turbulator on the flow and heat transfer characteristics of flat plate solar air heater using two dimensional CFD analysis. The analysis is carried out using the CFD software tool ANSYS Fluent for the flow Reynolds number ranging from 9000 to 21,000.The relative pitch(P/e) of the U-shaped rib is varied as 5, 10, 25 and 40 for a fixed relative rib height of 0.0421. It is shown that the U-shaped rib augments the Nusselt number by about 1.76 times while the friction factor increased by about 1.95 times with reference to smooth duct for a relative pitch of 10 and 5 respectively. The maximum thermal enhancement factor is obtained as 1.5 for the configuration of P/e=25. A comparative analysis of U-shaped rib with circular rib reveals that the U-shaped rib turbulator is found to be more effective in providing heat transfer enhancement and has about 15% higher thermal enhancement factor as compared to circular turbulator.

scholarly journals Flow and Wall Heat Transfer due to a Continuously Moving Slender Needle in Hybrid Nanofluid with Stability Analysis

2020 ◽  
Vol 76 (3) ◽  
pp. 62-74
Author(s):  
Siti Nur Alwani Salleh ◽  
Norfifah Bachok ◽  
Fadzilah Md Ali ◽  
Norihan Md Arifin
Keyword(s):  
Heat Transfer ◽  
Differential Equations ◽  
Volume Fraction ◽  
Numerical Study ◽  
Velocity Ratio ◽  
Hybrid Nanoparticles ◽  
Graphical Form ◽  
Hybrid Nanofluid ◽  
Unstable Flow ◽  
Branch Solution

Present work deals with the numerical study of flow due to a continuously moving slender needle in a hybrid nanoliquid. The mathematical model of this work is developed in terms of nonlinear partial differential equations. By adopting the relevant similarity transformations, these equations are reduced to a system of nonlinear ordinary differential equations. Afterward, the solution is determined computationally via a bvp4c solver in MATLAB software. The influences of nanoparticle volume fraction, needle thickness and velocity ratio parameter on the rate of heat transfer, coefficient of skin friction, velocity as well as temperature distributions are illustrated in graphical form to describe the important features of the solution. The multiple solutions seem to appear when the needle opposes the free stream flow. It is revealed from the study that the composite (hybrid) nanoparticles augment the heat transfer rate between the flow and the needle in a certain domain of the velocity ratio parameter. The analysis of stability has proved that the upper branch solution represents stable flow, whereas the lower branch solution represents unstable flow.

scholarly journals Significant Production of Thermal Energy in Partially Ionized Hyperbolic Tangent Material Based on Ternary Hybrid Nanomaterials

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6911
Author(s):  
Umar Nazir ◽  
Muhammad Sohail ◽  
Muhammad Bilal Hafeez ◽  
Marek Krawczuk
Keyword(s):  
Finite Element ◽  
Partial Differential Equations ◽  
Differential Equations ◽  
Thermal Energy ◽  
Fluid Velocity ◽  
Weissenberg Number ◽  
Hybrid Nanoparticles ◽  
Hyperbolic Tangent ◽  
Partial Differential ◽  
Partially Ionized

Nanoparticles are frequently used to enhance the thermal performance of numerous materials. This study has many practical applications for activities that have to minimize losses of energy due to several impacts. This study investigates the inclusion of ternary hybrid nanoparticles in a partially ionized hyperbolic tangent liquid passed over a stretched melting surface. The fluid motion equation is presented by considering the rotation effect. The thermal energy expression is derived by the contribution of Joule heat and viscous dissipation. Flow equations were modeled by using the concept of boundary layer theory, which occurs in the form of a coupled system of partial differential equations (PDEs). To reduce the complexity, the derived PDEs (partial differential equations) were transformed into a set of ordinary differential equations (ODEs) by engaging in similarity transformations. Afterwards, the converted ODEs were handled via a finite element procedure. The utilization and effectiveness of the methodology are demonstrated by listing the mesh-free survey and comparative analysis. Several important graphs were prepared to show the contribution of emerging parameters on fluid velocity and temperature profile. The findings show that the finite element method is a powerful tool for handling the complex coupled ordinary differential equation system, arising in fluid mechanics and other related dissipation applications in applied science. Furthermore, enhancements in the Forchheimer parameter and the Weissenberg number are necessary to control the fluid velocity.

Numerical investigation of electrohydrodynamic effects on the airflow through corrugated channels

2013 ◽  
Vol 227 (12) ◽  
pp. 2730-2741 ◽  
Author(s):  
HM Deylami ◽  
N Amanifard ◽  
F Dolati ◽  
R Kouhikamali ◽  
K Mostajiri
Keyword(s):  
Enhancement Factor ◽  
Average Nusselt Number ◽  
Numerical Study ◽  
Convection Heat Transfer ◽  
Numerical Approach ◽  
Two Dimensional ◽  
Air Stream ◽  
Thermal Enhancement ◽  
Thermal Enhancement Factor ◽  
Electrohydrodynamic Actuator

To enhance the forced convection heat transfer of turbulent air stream inside the different corrugated channels, a numerical study has been conducted to explore the effect of electrohydrodynamic actuator. In this regard, a two-dimensional numerical approach has been developed to evaluate the average Nusselt number and friction factor. The results obtained show that, while the thermal enhancement factor without electrohydrodynamic is best with trapezoidal corrugation for flows in the low Reynolds number regime, the addition of electrohydrodynamic works best with rectangular corrugation.

Experimental and numerical study of thermal enhancement in reentrant copper microchannels

2015 ◽  
Vol 91 ◽  
pp. 656-670 ◽  
Author(s):  
Daxiang Deng ◽  
Wei Wan ◽  
Yong Tang ◽  
Haoran Shao ◽  
Yue Huang
Keyword(s):  
Numerical Study ◽  
Thermal Enhancement
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