Development of laminar mixed convection flow in a horizontal rectangular duct with uniform bottom heating

Journal Article · Thu Jan 01 04:00:00 EST 1987 · Numer. Heat Transfer; (United States)

DOI:https://doi.org/10.1080/10407798708552571· OSTI ID:5825906

Mahaney, H V; Incropera, F P; Ramadhyani, S

Using a vectorized finite-difference marching technique, the steady-state continuity, momentum, and energy equations are solved numerically to evaluate the effects of buoyancy-induced secondary flow on forced flow in a horizontal rectangular duct with uniform bottom heating. Combined entry region conditions are considered, and the secondary flow is found to consist of longitudinal plumes and vortices that first develop at the vertical sidewalls and subsequently propagate to interior spanwise positions. Sequential stages of the secondary flow development are computed in detail and used to interpret the nonmonotonic longitudinal distribution of the spanwise average Nusselt number. The distribution is characterized by oscillations that, under certain conditions, are damped and yield a fully developed Nusselt number that substantially exceeds the value for pure forced convection.

• Research Organization: Heat Transfer Lab., School of Mechanical Engineering, Purdue Univ., West Lafayette, IN 47907
• OSTI ID: 5825906
• Journal Information: Numer. Heat Transfer; (United States), Journal Name: Numer. Heat Transfer; (United States) Vol. 12:2; ISSN NUHTD
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
CONFIGURATION
CONVECTION
DAMPING
DUCTS
ENERGY TRANSFER
FLUID FLOW
FLUID MECHANICS
FORCED CONVECTION
HEAT TRANSFER
HEATING
HYDRODYNAMICS
LAMINAR FLOW
MASS TRANSFER
MECHANICS
NUMERICAL SOLUTION
NUSSELT NUMBER
RECTANGULAR CONFIGURATION
STEADY-STATE CONDITIONS
TEMPERATURE DISTRIBUTION
THERMODYNAMICS
TURBULENCE
WAVE PROPAGATION