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Abstract
In transient heat-transfer experiments, the time to activate the thermochromic liquid crystal (TLC) can be used to evaluate h, the heat transfer coefficient. Most experimenters use the solution of Fourier's equation for a semi-infinite substrate with a step-change in the temperature of the fluid to determine h. The 'semi-infinite solution' can also be used to determine T ad, the adiabatic surface temperature, but this is an error-prone method suitable only for experiments with relatively large values of Bi, the Biot number. For Bi > 2, which covers most practical cases, more accurate results could be achieved using a composite substrate of two materials. Using TLC to determine the temperature-time history of the surface of the composite substrate, h and T ad could be computed from the numerical solution of Fourier's equation. Alternatively, h and T ad could be determined analytically from a combination of the semi-infinite and steady-state solutions.
Original language | English |
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Pages (from-to) | 5908-5915 |
Number of pages | 8 |
Journal | International Journal of Heat and Mass Transfer |
Volume | 55 |
Issue number | 21-22 |
Early online date | 10 Jul 2012 |
DOIs | |
Publication status | Published - Oct 2012 |
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Dive into the research topics of 'Solutions of Fourier's equation appropriate for experiments using thermochromic liquid crystal'. Together they form a unique fingerprint.Projects
- 1 Finished
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Measurement and Modelling of Ingress
Lock, G. (PI), Owen, M. (CoI), Robinson, K. (CoI) & Wilson, M. (CoI)
Engineering and Physical Sciences Research Council
1/10/09 → 30/09/12
Project: Research council