Experimental And Numerical Investigation Of
Real World Dimpled Heat Exchanger
Author(s)
S. Preibisch & M. H. Buschmann
Abstract
This study is motivated by the observation that recent investigations of dimpled
surfaces rarely go beyond single plates or channels. Here, we explore a real
world cross flow heat exchanger (400400100 mm³). It is found that in any
dimpled configuration the exchanged heat is larger than in the reference case
(smooth walls). The enhancement of the specific heat transfer per unit area can
exceed 40%. Reasonable agreement of global parameters with numerical
simulations (FLUENT) is obtained when the whole heat exchanger considering
each individual structure is modelled. Based on that finding we analyse the
numerical results in order to obtain information on local flow situation and in
order to find physical explanations for the different enhancement found in
different geometrical configurations.
Keywords: heat exchangers, dimples, experiment, numerical simulation.
1 Introduction
Heat exchangers play a central role in process engineering, air conditioning
heating and many other technical applications. Analysing the international
literature, we see great progress being made in developing new and advanced
technologies to improve traditional heat exchangers like cross- and counter-flow
heat exchangers (see e.g. Gad-el-Hak [1]). However, the majority of these
investigations are restricted to rather less academic subjects. In reality, a heat
exchanger is much more complex than the often examined single plates and
passages.
In this study we look at a complete cross-flow heat exchanger. Our general
strategy is to combine experimental investigations of global parameters like
Keywords
heat exchangers, dimples, experiment, numerical simulation
Related Book
Other papers in this volume
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