Heat Transfer and Thermal Deformation Characteristics of Liquid-Cooled Laser Mirror

A coupled finite volume-element method is developed to simulate the transient thermal deformation of water-cooled mirror by considering fluid flow and convective heat transfer. The simulation process consists of two steps: the 3D finite volume models of fluid flow and heat transfer equation are solved to obtain the time-dependent temperature field by using CFD; then, the obtained temperature field used as final temperature field is unidirectionally coupled to the finite element model for solving the thermoplastic equation. It is concluded that fluid flow not only affects the magnitude of temperature rise and thermal deformation, but also affects the distribution of temperature and thermal deformation. The temperature gradient in the thickness direction ( z direction) is found to be much larger than that in transverse direction. It is found that the temperature and the consequent deformation of water-cooled mirror increase significantly in the first seconds and gradually become steady state in the subsequent time. Experiments are conducted to estimate the precision of numerical models, and the experimental results agree well with the simulated results.

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Verification of Finite Volume Computations on Steady-State Fluid Flow and Heat Transfer

Journal of Fluids Engineering ◽

10.1115/1.1436092 ◽

2001 ◽

Vol 124 (1) ◽

pp. 11-21 ◽

Cited By ~ 65

Author(s):

J. Cadafalch ◽

C. D. Pe´rez-Segarra ◽

R. Co`nsul ◽

A. Oliva

Keyword(s):

Heat Transfer ◽

Fluid Flow ◽

Steady State ◽

Finite Volume ◽

Numerical Solutions ◽

Three Dimensional ◽

Independent Solution ◽

Post Processing ◽

Square Duct ◽

Flow And Heat Transfer

This work presents a post-processing tool for the verification of steady-state fluid flow and heat transfer finite volume computations. It is based both on the generalized Richardson extrapolation and the Grid Convergence Index GCI. The observed order of accuracy and a error band where the grid independent solution is expected to be contained are estimated. The results corresponding to the following two and three-dimensional steady-state simulations are post-processed: a flow inside a cavity with moving top wall, an axisymmetric turbulent flow through a compressor valve, a premixed methane/air laminar flat flame on a perforated burner, and the heat transfer from an isothermal cylinder enclosed by a square duct. Discussion is carried out about the certainty of the estimators obtained with the post-processing procedure. They have been shown to be useful parameters in order to assess credibility and quality to the reported numerical solutions.

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Conservatism of the Grid Convergence Index in Finite Volume Computations on Steady-State Fluid Flow and Heat Transfer

Journal of Fluids Engineering ◽

10.1115/1.1588692 ◽

2003 ◽

Vol 125 (4) ◽

pp. 731-732 ◽

Cited By ~ 43

Author(s):

Patrick J. Roache

Keyword(s):

Heat Transfer ◽

Fluid Flow ◽

Steady State ◽

Finite Volume ◽

Flow And Heat Transfer ◽

Grid Convergence ◽

Grid Convergence Index

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Implementation of boundary conditions and global mass conservation in pressure-based finite volume method on unstructured grids for fluid flow and heat transfer simulations

International Journal of Heat and Mass Transfer ◽

10.1016/j.ijheatmasstransfer.2012.05.030 ◽

2012 ◽

Vol 55 (19-20) ◽

pp. 5233-5243 ◽

Cited By ~ 9

Author(s):

S.-C. Xue ◽

G.W. Barton

Keyword(s):

Heat Transfer ◽

Fluid Flow ◽

Boundary Conditions ◽

Finite Volume Method ◽

Finite Volume ◽

Unstructured Grids ◽

Mass Conservation ◽

Flow And Heat Transfer ◽

Volume Method

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Numerical Simulation of Fluid Flow and Heat Transfer in U-Shape Microchannels

Volume 7: Fluid Flow, Heat Transfer and Thermal Systems, Parts A and B ◽

10.1115/imece2010-39816 ◽

2010 ◽

Cited By ~ 3

Author(s):

Tiantian Zhang ◽

Li Jia ◽

Jingru Zhang ◽

Yogesh Jaluria

Keyword(s):

Heat Transfer ◽

Numerical Simulation ◽

Fluid Flow ◽

Channel Model ◽

Numerical Models ◽

Experimental System ◽

Flow And Heat Transfer ◽

Realistic Modeling ◽

Fabrication Procedure ◽

Set Up

An experimental system on the fluid flow in microchannels with heat generation at the bottom has been set up. This system approximates the use of microchannel flow for the cooling of electronic components. The fabrication procedure of the test section is introduced briefly. Then, different flow rates and heat input have been proposed to study the effect of these parameters experimentally. Several numerical models have been given to simulate this process. By comparing the results from these models and the experimental data, it is found that the “two channel model”, which employ two channels with periodic boundary conditions, is the best model to simulate the overall heat transfer performance. The study considers the use of combined experimental and numerical simulation for an accurate and realistic modeling of such complex microchannel systems.

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