Mathematical modeling of the solar regenerative heat exchanger under turbulent oscillating flow: Applications of renewable and sustainable energy and artificial heart

Beni, Hamidreza Mortazavy; Mortazavi, Hamed

doi:10.1016/j.rineng.2021.100321

Cited by 17 publications

(10 citation statements)

References 15 publications

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“…With the help of accurate numerical methods, the conditions are provided for examination of the human body in a way that in vitro results can accurately predict in vivo processes in the body [10,11].…”

Section: Discussionmentioning

confidence: 99%

Moving deforming mesh modeling of human organ systems

Beni

Mortazavi

Paul

et al. 2022

Proceedings of the 7th International Digital Human Modeling Symposium -

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Dynamic modeling of body organs has become an elementary part of modern digital human modeling (DHM), where advanced biomedical models incorporate biomechanical behavior of tissues down to the cell level. While the biomechanical response of organs to impact and trauma has traditionally been considered an important aspect in developing safety related models such as for vehicle crash simulation, organ behavior is now also reflected in models used for medical purposes, such as the simulation of breathing or cardiovascular circulation. All human body cells have in vivo nonlinear viscoelastic properties. Moreover, body tissue is composed of cells wrapped in an extracellular matrix (ECM). Body tissue in vivo nonlinear viscoelastic properties depend on its function in an organ system, which directly affects the tissue viscoelasticity modulus.

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Section: Discussionmentioning

confidence: 99%

Moving deforming mesh modeling of human organ systems

Beni

Mortazavi

Paul

et al. 2022

Proceedings of the 7th International Digital Human Modeling Symposium -

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“…Lagrange is obtained by the difference of the total kinetic energy from the total potential energy, and finally, by placing Lagrange in in the principal Lagrange in equation (equation 17) and performing the necessary derivations, the dynamic differential equation of the Stirling engine is obtained. The torque is equivalent to the engine crankshaft while indicating the crankshaft angle [24].…”

Section: Kinetic Equations Of the Modelmentioning

confidence: 99%

Experimental investigation of gamma Stirling refrigerator to convert thermal to cooling energy utilizing different gases

Asemi¹,

Daneshgar²,

Zahedi³

2023

futech

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In recent years, combined cooling, heat, and power (CCHP) systems have attracted increasing attention worldwide. Owing to their advantages of high overall thermal efficiency, fuel flexibility, low noise and vibration, and low emissions, Stirling engines are promising candidates for micro-CCHP systems. The Stirling Cycle is one of the thermodynamic cycles that is close to the Carnot cycle in terms of theory, and these advantages cause to use of Stirling engines in wide industries. The main objective of this research is an experimental investigation of the Stirling Gamma engine for refrigeration. In this investigation, the effect of working fluid air and Helium, the operating pressure of the working fluid, and dynamo power on refrigeration generation have been investigated. Results show that using air fluid with a power of 520.8 Watts and operating pressure of 3 bar in 10 minutes could reach to the temperature of -23° Celsius and using Helium fluid with a power of 420 Watts and operating pressure of 6 bar and in 10 minutes could reach to temperature -21° Celsius. In the experimental implementation, it has been tried to reach lower than 10 % error results in various parts of the engine like insulation, leaking, belt lash, and measurement devices. Results show that increasing power supply, mean gas pressure, power supply turning on duration, and using fluids such as air and helium are effective in refrigeration. Also, by using helium instead of air, the amount of cooling output and engine output power decreases while engine efficiency increases.

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“…It is additional in Equation () momentum fluxes due to the transient turbulent motion. The energy equation is in the following form [14]:

\begin{eqnarray} &&\frac{\partial }{{\partial {\rm{t}}}}\left( {\rho E} \right) + \nabla .\ \left( {\vec{V}\left( {\rho E + p} \right)} \right)\nonumber\\ &&\quad = \ \nabla . ({k_{eff}}\nabla T - \mathop \sum \limits_j {h_j}{\vec{J}_j} + \left( {{{\mathop \tau \limits^ = }_{eff}}.\vec{V}} \right))\end{eqnarray}

\begin{equation}{k_{eff}} = \ k + {k_t}\end{equation}

where

\vec{V}

{k_{eff}}

k

{k_t}

{\vec{J}_j}

, and

{\mathop \tau \limits^ = _{eff}}

are the overall velocity vector, effective conductivity, thermal conductivity, the turbulent thermal conductivity, the diffusion flux of species j , and stress tensor, respectively.…”

Section: Governing Equation and Boundary Conditionmentioning

confidence: 99%

“…2) momentum fluxes due to the transient turbulent motion. The energy equation is in the following form [14]:…”

Section: Governing Equation and Boundary Conditionmentioning

confidence: 99%

Thermal/fluid characteristics of the inline stacked plain‐weave screen as solar‐powered Stirling engine heat regenerators

Mortazavi

Beni

Islam

2022

IET Renewable Power Gen

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The present work demonstrates the results of a 3D numerical analysis of heat transfer and fluid flow through a fabricated aluminium wire filament, bonded mesh deployed as a regenerator surface in the Stirling engine. Here, two inline regenerator models with the same mass but different geometry were simulated by computational fluid dynamics (CFD) and finite element method (FEM). The results show that the temperature efficiency of both inline with non‐uniform and uniform wire diameters is almost equal. However, the non‐uniform diameter model is shorter and reaches the maximum thermal efficiency faster in reduced length <18$ < 18$. Also, it shows approximately 5% a greater mean thermal efficiency. In general, from this simulation, it can be seen that changes in the geometry of the heat regenerator can have a direct effect on thermal efficiency and pressure drop in the same mass. Therefore, using the inline stacked plain‐weave screen with a non‐uniform wire diameter regenerator in the powered Stirling engine is recommended due to space constraints. Small changes in the regenerator geometry lead to immense leaps in increasing a solar power plant's overall efficiency.

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Mathematical modeling of the solar regenerative heat exchanger under turbulent oscillating flow: Applications of renewable and sustainable energy and artificial heart

Cited by 17 publications

References 15 publications

Moving deforming mesh modeling of human organ systems

Moving deforming mesh modeling of human organ systems

Experimental investigation of gamma Stirling refrigerator to convert thermal to cooling energy utilizing different gases

Thermal/fluid characteristics of the inline stacked plain‐weave screen as solar‐powered Stirling engine heat regenerators

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