Mixed convection between horizontal plates and consequences for chemical vapor deposition flows
To simulate the fluid dynamics of VD systems, mixed convection between horizontal plates (AR = width/height = 10) heated from below was studied by laser Doppler anemometry in a range 1368 < Ra < 8300 and 15 < R3 < 170. The entrance effects were characterized by two lengths: one for the onset of bouyancy-driven instability, and one for the full development of longitudinal convection rolls. Explicit expressions for both entrance lengths are given in terms of Ra and Re. In addition, unsteady longitudinal convection rolls were observed. These are discussed in terms of the admixture of transverse convection rolls and/or contributions from upstream turbulence. For the fully developed region it is shown analytically that the transverse velocities of the longitudinal convection rolls, v and w, are independent of the forced flow and are identical to those of the two-dimensional Rayleigh-Benard convection rolls. These fundamental results serve as a base for the discussion of horizontal CVD flows. The entrance and sidewall effects are found to have pronounced influences on the flow patterns observed in CVD (AR = 2) reactors.
- Research Organization:
- Utah Univ., Salt Lake City (USA)
- OSTI ID:
- 6783239
- Country of Publication:
- United States
- Language:
- English
Similar Records
Lateral intrusion of natural convection into a horizontal porous structure
Magnetic resonance imaging of convection in porous media
Related Subjects
420400 -- Engineering-- Heat Transfer & Fluid Flow
420800 -- Engineering-- Electronic Circuits & Devices-- (-1989)
640410* -- Fluid Physics-- General Fluid Dynamics
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHEMICAL COATING
CHEMICAL VAPOR DEPOSITION
CONVECTION
DEPOSITION
ENERGY TRANSFER
FLOW MODELS
FLUID MECHANICS
HEAT TRANSFER
INSTABILITY
MASS TRANSFER
MATHEMATICAL MODELS
MECHANICS
PLATES
SIMULATION
SURFACE COATING