TECHNICAL PAPERS: Heat Transfer in Manufacturing

Characterization of Variable Thermal Contact Resistance in Rapid Contact Solidification Utilizing Novel Ultrasound Technique

[+] Author and Article Information
F. J. Hong

School of Mechanical and Power Engineering, Shanghai Jiao Tong University, Shanghai, China

H.-H. Qiu1

Department of Mechanical Engineering, Hong Kong University of Science and Technology, Kowloon, Hong Kong, SAR Chinameqiu@ust.hk


Corresponding author.

J. Heat Transfer 129(8), 1036-1045 (Sep 21, 2006) (10 pages) doi:10.1115/1.2724848 History: Received April 06, 2006; Revised September 21, 2006

A method based on a novel ultrasound technique and inverse heat transfer analysis was developed to study the transient thermal contact resistance (TCR) at the early stage of a rapid contact solidification process. This promising technique is nonintrusive and, therefore, provides no distortion to the contact surface as well as the heat transfer process. The effects of impact velocity and initial molten metal temperature on TCR were investigated in detail. An empirical equation that correlates the variable TCR with the initial and interfacial conditions was introduced utilizing the experimental data.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 1

The schematic diagram of a one-dimensional solidification problem

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Figure 2

The geometry, initial, and boundary conditions of the heat transfer problem

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Figure 3

The schematic diagram of the experimental setup

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Figure 4

The block diagram of the measurement system

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Figure 5

Typical recorded signals

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Figure 7

Typical phase difference change as a function of measurement number

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Figure 8

Typical time delay change as a function of time

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Figure 9

The variation of hcr with time for experiment 1

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Figure 14

The effect of initial PCM temperature on hcr

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Figure 16

The variation of Cc with Cqt

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Figure 17

a1, a2, a3, and a4 as a function of impact velocity

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Figure 18

The given and predicted variable thermal contact resistance (assuming ultrasound measurement errors with a standard deviation of 0.1ns)

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Figure 6

Abstracted signals to do cross-correlation

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Figure 10

The variation of UTDC with time for experiment 1

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Figure 11

The variation of temperatures with time for experiment 1

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Figure 12

The variation of hcr with time for experiment 2

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Figure 13

The variation of temperatures with time for experiment 2

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Figure 15

The effect of impact height on hcr




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