Effects of temperature dependent thermal conductivity on Nu number behavior in micro-tubes |
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Authors: | Dorin Lelea |
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Affiliation: | University Politehnica Timisoara, Faculty of Mechanical Engineering, Department of Thermal Machines and Transportation, B-dul Mihai Viteazu nr. 1, 300222 Timisoara, Romania |
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Abstract: | The numerical modeling of the conjugate heat transfer and fluid flow through the micro-tube was presented in the paper. Three different fluids with temperature dependent fluid properties are considered: water and two dielectric fluids, HFE-7600 and FC-70. The diameter ratio of the micro-tube was Di/Do = 0.1/03 mm with a tube length L = 70 mm, geometry used in D. Lelea, Nishio S., Takano K., The experimental research on microtube heat transfer and fluid flow of distilled water, International Journal of Heat and Mass Transfer 47 (2004) 2817–2830]. The laminar fluid flow regime is analyzed. Two different heat transfer conditions are considered: heating and cooling. The influence of the temperature dependent thermal conductivity on Nu number is analyzed for these two cases and compared with k = const. |
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Keywords: | Microchannels Conjugate heat transfer Nu number Thermal conductivity |
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