Influence of the Turbulence Number and Gas Flow Pulsations on the Heat Transfer Intensity in a Straight Channel

Abstract

The working fluid moving in a non-stationary (pulsating) mode is the basis of many technical and technological installations. In this regard, it is important to clarify the physical mechanism of the effect of pulsations and turbulence of the flow on the intensity of air heat transfer in the channel for different boundary conditions through an experimental approach. The article examines a single, straight pipe with a length of 1300 mm and a diameter of 30 mm (43 calibers). The range of Reynolds numbers Re = 10,000--140,000 (developed turbulent flow regime). The flow pulsations in the channel were created using a rotating damper with a frequency of 4--16 Hz. The flow turbulence number varied within 4--12 % using the installation of various flat plate inserts in the pipe. The thermal anemometry method is used to obtain data on non-stationary values of velocity and local heat transfer coefficient. The degree of influence of gas dynamic non-stationarity on the intensity of heat transfer in the channel is shown. It was found that an increase in the turbulence number of the pulsating flow to 12 % increases the heat transfer coefficient by 15--21 %. The maximum increase in the intensity of heat transfer (by 49--51 %) from the combined effect of pulsations and turbulence of the air flow in the channel is determined. The results obtained are applicable for debugging mathematical models anddesigning pipeline elements of technical systems with a working fluid moving in a pulsating mode

The work was supported by the Russian Science Foundation (project no. 25-19-00001)

Please cite this article in English as:

Plotnikov L.V., Osipov L.E. Influence of the turbulence number and gas flow pulsations on the heat transfer intensity in a straight channel. Herald of the Bauman Moscow State Technical University, Series Natural Sciences, 2026, no. 1 (124), pp. 81--96 (in Russ.). EDN: WJBDWY

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