Theoretical studies on the role of transition in determining friction and heat transfer in smooth and rough passages

Technical Report · Sun Apr 01 00:00:00 EST 1990

DOI:https://doi.org/10.2172/7150727· OSTI ID:7150727

Obot, N. T.; Esen, E. B. ^[1]; Rabas, T. J. ^[2]

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1. Clarkson Univ., Potsdam, NY (USA). Fluid Mechanics, Heat and Mass Transfer Lab.
2. Argonne National Lab., IL (USA)

It has been established that transition determines the attainable friction and heat transfer in smooth and rough passages. According to the proposed law of corresponding states for friction, different types of roughness exhibit the same general behavior for friction at the same reduced conditions. This is also true of different types of smooth passages. It has been fully demonstrated that, in rough passages, the marked increases in friction factor are intimately associated with early transition and that, under reduced similarity conditions, the friction factors are considerably lower than those deduced from the familiar f vs. Re plots. For all smooth or rough passages, the simple rule for heat transfer amounts to this: the lower the critical Reynolds number for transition, the greater the value for the average heat transfer coefficient. Consequently, for a given Reynolds number based on the hydraulic diameter, triangular passages can be expected to give heat transfer coefficients that are significantly higher than for circular, rectangular or annular tubes. For smooth and enhanced passages of complex shapes, it appears that heat transfer coefficients can be calculated accurately from the smooth circular tube relations, provided the critical Reynolds number is known. 61 refs., 25 figs., 1 tab.

• Research Organization: Clarkson Univ., Potsdam, NY (USA). Fluid Mechanics, Heat and Mass Transfer Lab.
• Sponsoring Organization: DOE/CE
• DOE Contract Number: FG02-89CE90029
• OSTI ID: 7150727
• Report Number(s): DOE/CE/90029-2; ON: DE90009987
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
TRANSITION FLOW
FLUID MECHANICS
FRICTION FACTOR
HEAT TRANSFER
TUBES
ROUGHNESS
ANNULAR SPACE
CIRCULAR CONFIGURATION
FLUID FLOW
FRICTION
LAMINAR FLOW
PROGRESS REPORT
RECOMMENDATIONS
REYNOLDS NUMBER
THEORETICAL DATA
TRIANGULAR CONFIGURATION
TURBULENT FLOW
CONFIGURATION
DATA
DOCUMENT TYPES
ENERGY TRANSFER
INFORMATION
MECHANICS
NUMERICAL DATA
SPACE
SURFACE PROPERTIES
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