Natural laminar-to-turbulent transition inside an electrically heated circular tube

Zhang Ruoling; Le Jialing

doi:10.11729/syltlx20150024

Volume 31 Issue 2

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Zhang Ruoling, Le Jialing. Natural laminar-to-turbulent transition inside an electrically heated circular tube[J]. Journal of Experiments in Fluid Mechanics, 2017, 31(2): 51-60. doi: 10.11729/syltlx20150024

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Natural laminar-to-turbulent transition inside an electrically heated circular tube

doi: 10.11729/syltlx20150024

Zhang Ruoling^,,
Le Jialing

Science and Technology on Scramjet Laboratory, Hypervelocity Aerodynamics Institute of China Aerodynamics Research and Development Center, Mianyang Sichuan 621000, China

Received Date: 2016-01-29
Rev Recd Date: 2016-10-13
Publish Date: 2017-04-25

Abstract

Abstract

The natural laminar-to-turbulent transitional flow and convective heat transfer inside an electrically heated circular tube are analyzed. It is proposed that the transitional flow can be decomposed into the fully developed laminar flow and the turbulent flow, under the assumption that the fluctuating velocity in the radial direction does not change with varying flow modes. The composite ratios are adopted to define the composite flow, and they fluctuate during the flow transition. The minimum entropy production criterion is used to derive an equation which can describe the evolution of the transitional flow. It is deduced that the transitional behavior is governed by the fluctuations of the composite ratios. One fluctuation function is given to attain agreements with measurements including those obtained in heat transfer and flow experiments. It is pointed out that the process of the laminar-to-turbulent transition inside the tube can be compared with continuous phase transitions in a thermodynamic equilibrium system, and similar and separate processes for the transitions of the velocity and temperature inside the tube can be allowed.
- transitional flow,
- fluctuations,
- composition of flows,
- minimum entropy production

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References(17)

References

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