Effect of thermal boundary condition on the wall of a flat channel and axial thermal conductivity of a liquid on heat transfer in a laminar pulsating flow in a quasistationary regime

E. P. Valueva

National Research University "Moscow Power Engineering Institute"

Abstract: The possibility of increasing the efficiency of heat transfer devices by imposing flow pulsations with large oscillation amplitudes on a laminar flow is investigated. The greatest increase in heat transfer in a pulsating flow compared to a stationary flow occurs in the region of relatively low flow pulsation frequencies, i.e. in a quasi-stationary regime. The average Nusselt number over the channel length and over time can increase by 50% compared to its value in a stationary flow, and in the case of the influence of axial thermal conductivity of the liquid for small Peclet numbers and relatively short pipes – by several times.

Keywords: heat transfer, pulsating quasi-stationary flow, axial thermal conductivity.

Received: 09.01.2025
Revised: 27.02.2025
Accepted: 27.02.2025

DOI: 10.61011/PJTF.2025.11.60482.20253

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