Application of the Temperature Oscillation Method to Laminar Flow in Straight Horizontal and Curved Minichannels

Stanislav Solnař (), Stefan Haase and Tomáš Jirout
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Stanislav Solnař: Department of Process Engineering, Faculty of Mechanical Engineering, Czech Technical University in Prague, 16000 Prague, Czech Republic
Stefan Haase: Department of Chemical Reaction Engineering and Process Plants, Technische Universitat Dresden, 01069 Dresden, Germany
Tomáš Jirout: Department of Process Engineering, Faculty of Mechanical Engineering, Czech Technical University in Prague, 16000 Prague, Czech Republic

Energies, 2023, vol. 16, issue 4, 1-20

Abstract: This work deals with the application of the temperature oscillation method to measure local values of the heat transfer coefficient in laminar flow in a straight horizontal pipe and in a pipe with a bend. This method, applied here for the first time in such experimental conditions, uses a time-varying heat flux as a boundary condition, which is a condition of the third kind. Since an analytical solution for such conditions could not be identified in the existing literature, a numerical study of this problem is applied here. Experimental data for a straight horizontal pipe confirm the numerical results within a reasonable level of error. Experimental measurements on a straight horizontal tube are consistent with predicted results in the literature for both total and local heat transfer coefficient values. The measurements on bent tubes show a very significant influence on the local values compared to the straight tube and in the overall values this change appears as an increase in the heat transfer coefficient.

Keywords: laminar flow; temperature oscillation method; heat transfer; TOIRT method (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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