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This content will become publicly available on March 7, 2019

Title: Internal convective heat transfer to gases in the low-Reynolds-number “turbulent” range

For internal vertical gas flow in tubes with strong heating rates at low turbulent Reynolds numbers, a typical experimental observation is that the local Nusselt number varies roughly as the square of the decreasing local Reynolds number. An aim of the present note is to examine this situation. This examination leads to the hypothesis that the behavior results from the evolution of the thermal boundary layer developing within the primarily molecular transport layer which is also growing from the wall. Comparisons to direct numerical simulations demonstrate that reasonable predictions are provided by an extension of the Leveque similarity analysis for laminar thermal boundary layers. Furthermore, the present observations modify and improve our fundamental understanding of the process called “relaminarization” in these flows.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Univ. of Idaho, Idaho Falls, ID (United States); Idaho National Lab. (INL), Idaho Falls, ID (United States); Institut fur Kernenergetik und Energiesysteme, Stuttgart/Vaihingen (Germany)
  2. Institut fur Kernenergetik und Energiesysteme, Stuttgart/Vaihingen (Germany); Institut fur Thermodynamik der Luft- und Raumfahrt, Stuttgart/Vaihingen (Germany)
  3. Idaho National Lab. (INL), Idaho Falls, ID (United States)
  4. Institut fur Kernenergetik und Energiesysteme, Stuttgart/Vaihingen (Germany)
Publication Date:
Report Number(s):
INL/JOU-17-42635
Journal ID: ISSN 0017-9310; PII: S0017931017335986
Grant/Contract Number:
NE0008412; AC07-05ID14517
Type:
Accepted Manuscript
Journal Name:
International Journal of Heat and Mass Transfer
Additional Journal Information:
Journal Volume: 121; Journal Issue: C; Journal ID: ISSN 0017-9310
Publisher:
Elsevier
Research Org:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
99 GENERAL AND MISCELLANEOUS; Laminarization; Vertical tubes; Internal convective heat transfer; Gas property variation; Low-Reynolds-number turbulent; Reverse transition
OSTI Identifier:
1434302