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Research methods in the study of heat transfer coefficient during flow in minichannels

Tychanicz-Kwiecień Maria, Grosicki Sebastian

Journal of Mechanical and Energy Engineering

2021

Vol. 5, No 1

59--67

The paper presents the specification of research methods commonly encountered in the studies of heat transfer processes in minichannels. In particular the following methods have been emphasized: electrochemical limiting current method as well as the thermal balance method. In thermal balance method the mean heat transfer coefficient is determined by the set of experimental thermal measurements of the investigated heat exchanger. In turn, limiting current method is based on heat and mass transfer analogy. The discussed research methods have been implemented on two specially designed and constructed test facilities with compact minichannel heat exchangers, which have been presented and described in details. In order to validate the designed setup, the preliminary experimental measurements of two minichannel heat exchangers with hydraulic diameter of 2 mm and rectangular cross sections during single-phase liquid flows have been carried out. In further perspective it is planned to extend the experimental studies of minichannel heat exchangers and to compare the results obtained by both methods described.

Analogia wymiany ciapła i masy w charakterystycznych strefach pęcherzykowego złoża fluidalnego

Ciesielczyk W., Widełka W.

Inżynieria i Aparatura Chemiczna

2006

Nr 6s

44-45

The values of heat and mass transfer factors according to the Chilian-Colburn approach have been determined. It has been found that the heat and mass transfer analogy is valid in the zone of bubbles for y& content of particles. This analogy is not valid in the emulsion zone. The fluidized-bed drying process for materials of a group B due to the Geldart- classification has been analysed.