Thermophoretic transport of particles that act as volumetric heat sources in natural convection flow
- Oak Ridge National Lab., TN (USA)
The natural convection boundary layer with suspended heat generating aerosol particles adjacent to a cooled, isothermal, vertical wall was investigated for the following circumstances: laminar and turbulent flow, large temperature differences between the wall and the fluid, stable thermal stratification far from the wall, and fluid participation in thermal radiation heat transfer. The deposition of aerosol particles by thermophoresis was investigated. A scaling analysis showed the negligible effect inside the boundary layer of the particulate heat source strengths of practical interest. Only the temperature of the fluid far from the wall is affected appreciably by the heat sources. The scaled boundary layer differential equations are transformed to a nonsimilarity form for numerical solution using two different methods. An expression for the ratio of mass transfer to heat transfer coefficients was developed to simplify the computation of thermophoretic particle deposition at the wall for the case of constant temperature conditions far from the wall. Variable thermophysical property effect for the three gases of steam, air, and hydrogen were investigated. A dimensionless ratio of transfer coefficients for large temperature differences and turbulent flow was computed as a product of the laminar constant property results and a ratio of the known thermophysical properties at the wall and far from the wall. An approximation of the laminar constant property results for all three gases is developed in terms of the known wall and fluid temperatures, Prandtl number, and a thermophoretic constant. This allows particle deposition to be computed from a known heat transfer coefficient without explicitly solving the particle conservation equation. 120 refs., 29 figs., 21 tabs.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5434372
- Report Number(s):
- ORNL-6573; ON: DE90000966
- Resource Relation:
- Other Information: Thesis (Ph.D.). Thesis. Submitted by J.C. Conklin to University of Tennessee, Knoxville, TN
- Country of Publication:
- United States
- Language:
- English
Similar Records
Research on thermophoretic and inertial aspects of ash particle deposition on heat exchanger surfaces in coal-fired equipment
Modeling of thermophoretic deposition of aerosols in nuclear reactor containments
Related Subjects
BWR TYPE REACTORS
HEAT TRANSFER
CONVECTION
HYDRAULICS
MASS TRANSFER
NUMERICAL SOLUTION
PARTICLES
TURBULENT FLOW
ENERGY TRANSFER
FLUID FLOW
FLUID MECHANICS
MECHANICS
REACTORS
WATER COOLED REACTORS
WATER MODERATED REACTORS
210100* - Power Reactors
Nonbreeding
Light-Water Moderated
Boiling Water Cooled