Entrance-length dendritic plate heat exchangers

Bejan, A.; Alalaimi, M.; Sabau, A. S.; Lorente, S.

doi:10.1016/j.ijheatmasstransfer.2017.06.094

Title: Entrance-length dendritic plate heat exchangers

Journal Article · Mon Jul 17 00:00:00 EDT 2017 · International Journal of Heat and Mass Transfer

DOI:https://doi.org/10.1016/j.ijheatmasstransfer.2017.06.094· OSTI ID:1376642

Bejan, A. ^[1]; Alalaimi, M. ^[2];

^[3]; Lorente, S. ^[4]

Duke Univ., Durham, NC (United States)
Kuwait Univ., Safat (Kuwait)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Toulouse (France)

We explore the idea that the highest heat transfer rate between two fluids in a given volume is achieved when plate channel lengths are given by the thermal entrance length, i.e., when the thermal boundary layers meet at the exit of each channel. The overall design can be thought of an elemental construct of a dendritic heat exchanger, which consists of two tree-shaped streams arranged in cross flow. Every channel is as long as the thermal entrance length of the developing flow that resides in that channel. The results indicate that the overall design will change with the total volume and total number of channels. We found that the lengths of the surfaces swept in cross flow would have to decrease sizably as number of channels increases, while exhibiting mild decreases as total volume increases. The aspect ratio of each surface swept by fluid in cross flow should be approximately square, independent of total number of channels and volume. We also found that the minimum pumping power decreases sensibly as the total number of channels and the volume increase. FurtherThe maximized heat transfer rate per unit volume increases sharply as the total volume decreases, in agreement with the natural evolution toward miniaturization in technology.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Geothermal Technologies Office

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1376642

Alternate ID(s):: OSTI ID: 1495552

Journal Information:: International Journal of Heat and Mass Transfer, Vol. 114, Issue C; ISSN 0017-9310

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 20 works

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