scholarly journals Validation of accuracy and stability of numerical simulation for 2-D heat transfer system by an entropy production approach

2017 ◽  
Vol 21 (suppl. 1) ◽  
pp. 97-104
Author(s):  
Ali Brohi ◽  
Haochun Zhang ◽  
Kossi Min-Dianey ◽  
Muhammad Rafique ◽  
Muhammad Hassan ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Heat Conduction ◽  
Entropy Production ◽  
Heat Conduction Problem ◽  
Current Approach ◽  
Transfer System ◽  
Heat Transfer System ◽  
The Stability ◽  
Accuracy And Stability

The entropy production in 2-D heat transfer system has been analyzed systematically by using the finite volume method, to develop new criteria for the numerical simulation in case of multidimensional systems, with the aid of the CFD codes. The steady-state heat conduction problem has been investigated for entropy production, and the entropy production profile has been calculated based upon the current approach. From results for 2-D heat conduction, it can be found that the stability of entropy production profile exhibits a better agreement with the exact solution accordingly, and the current approach is effective for measuring the accuracy and stability of numerical simulations for heat transfer problems.

scholarly journals Numerical simulation and experimental verification of stability on multi-cavity spiral cascade heat transfer system

2020 ◽  
pp. 319-319
Author(s):  
Haijun Liu ◽  
Zhanbin Guo ◽  
Lixin Zhao ◽  
Xinyu Wang ◽  
Shan Lan
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Experimental Verification ◽  
Flue Gas ◽  
Raw Materials ◽  
Flow Speed ◽  
Stable Operation ◽  
Transfer System ◽  
Pyrolysis Gas ◽  
Heat Transfer System

In order to improve the insufficient effect of heat transfer in pyrolysis carbonization system and reveal the effects of velocity and temperature field of hot flue gas on heat transfer and stability in the biomass, the structure with rectangular groove combined with a spiral baffle is designed to form a multi-cavity spiral cascade heat transfer system. Numerical simulation and experimental verification of stability are carried on multi-cavity spiral cascade heat transfer system. The results show that the hot flue gas with high temperature flows fast at the inlet and outlet, while the flow speed is slow and stable in the cavity of heat transfer. The temperature of hot flue gas reaches the highest at the entrance, and decreases in the heat exchange chamber in a cascade. The spiral inclination angle of 35? and the pitch of 1.2m. The combustion of gas produced by pyrolysis of raw materials can meet the requirement of continuous and stable operation, when the temperature of monitor point 1, 3, 6 and 8 reaches 800 ?, 530 ?, 250 ?and 200 ? respectively. The temperature of hot flue gas changes fluctuate in the range of 15 ?. The combustion of pyrolysis gas generated during the pyrolysis process of raw materials can ensure the continuous and stable operation of the equipment.

scholarly journals Influence of Input Parameters on the Solution of Inverse Heat Conduction Problem

2020 ◽  
Author(s):  
Rakhab C. Mehta
Keyword(s):  
Heat Transfer ◽  
Heat Conduction ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Heat Conduction Problem ◽  
Inverse Heat Conduction Problem ◽  
Inverse Heat Conduction ◽  
Input Parameters ◽  
Solid Rocket ◽  
The Stability

A one-dimensional transient heat conduction equation is solved using analytical and numerical methods. An iterative technique is employed which estimates unknown boundary conditions from the measured temperature time history. The focus of the present chapter is to investigate effects of input parameters such as time delay, thermocouple cavity, error in the location of thermocouple position and time- and temperature-dependent thermophysical properties. Inverse heat conduction problem IHCP is solved with and without material conduction. A two-time level implicit finite difference numerical method is used to solve nonlinear heat conduction problem. Effects of uniform, nonuniform and deforming computational grids on the estimated convective heat transfer are investigated in a nozzle of solid rocket motor. A unified heat transfer analysis is presented to obtain wall heat flux and convective heat transfer coefficient in a rocket nozzle. A two-node exact solution technique is applied to estimate aerodynamic heating in a free flight of a sounding rocket. The stability of the solution of the inverse heat conduction problem is sensitive to the spatial and temporal discretization.

Preliminary design of EU DEMO helium-cooled breeding blanket primary heat transfer system

2018 ◽  
Vol 136 ◽  
pp. 1567-1571 ◽  
Author(s):  
I. Moscato ◽  
L. Barucca ◽  
S. Ciattaglia ◽  
P.A. Di Maio ◽  
G. Federici
Keyword(s):  
Heat Transfer ◽  
Preliminary Design ◽  
Transfer System ◽  
Heat Transfer System

scholarly journals A Meshless Method Based on the Fundamental Solution and Radial Basis Function for Solving an Inverse Heat Conduction Problem

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Muhammad Arghand ◽  
Majid Amirfakhrian
Keyword(s):  
Heat Conduction ◽  
Fundamental Solution ◽  
Meshless Method ◽  
Heat Conduction Problem ◽  
Regularization Parameter ◽  
Linear Equations ◽  
Inverse Heat Conduction Problem ◽  
Inverse Heat Conduction ◽  
Radial Basis ◽  
The Stability

We propose a new meshless method to solve a backward inverse heat conduction problem. The numerical scheme, based on the fundamental solution of the heat equation and radial basis functions (RBFs), is used to obtain a numerical solution. Since the coefficients matrix is ill-conditioned, the Tikhonov regularization (TR) method is employed to solve the resulted system of linear equations. Also, the generalized cross-validation (GCV) criterion is applied to choose a regularization parameter. A test problem demonstrates the stability, accuracy, and efficiency of the proposed method.

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