Mixed convection heat transfer with longitudinal fins in a horizontal parallel plate channel: Part 2 - Experimental results

Journal Article · Wed Aug 01 04:00:00 EDT 1990 · Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States)

DOI:https://doi.org/10.1115/1.2910432· OSTI ID:5199309

Maughan, J R; Incropera, F P ^[1]

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1. Purdue Univ., West Lafayette, IN (USA)

Experiments have been performed to investigate the effects of longitudinal fins on laminar mixed convection in airflow between parallel plates, with the bottom plate heated isothermally and the top plate cooled isothermally. In addition to the unfinned condition, nondimensional fin spacings in the range 0.25 < A < 2.0 were considered for relative fin heights of F = 0.5 and 0.9 and for the Rayleigh number range 760 < Ra < 29700. For fully developed flow over the unfinned surface, square longitudinal vortices (A = 1.0) were observed for Ra > Ra{sub c} and persisted until Ra {approx}20,000. While data for closely spaced fins showed considerable enhancement at lower Rayleigh numbers due to the additional surface area, the development of vigorous secondary flow was delayed. Hence, for fully developed conditions and F = 0.5, Nusselt numbers for the finned surface were, in some instances, lower than those for mixed convection without fins. Results are compared to previous numerical predictions, and it is shown that agreement is good until the flow violates modeling assumptions of steady, symmetric flow between fins.

• OSTI ID: 5199309
• Journal Information: Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States), Journal Name: Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States) Vol. 112:3; ISSN 0022-1481; ISSN JHTRA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer &amp; Fluid Flow
DATA
ENERGY TRANSFER
EXPERIMENTAL DATA
FINS
FLUID FLOW
HEAT EXCHANGERS
HEAT TRANSFER
INFORMATION
LAMINAR FLOW
MATHEMATICAL MODELS
NUMERICAL DATA
VANES