Heat transfer in high temperature packed beds

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1984

OSTI ID:5225659

Harris, J A

A packed bed is modeled as a homogeneous gray medium in which heat is transferred by conduction, convection, and radiation. The problem is formulated wherein the packed bed is contained between concentric gray cylinders that are axially isothermal. The outer cylinder is at a high temperature, and heat transfer is radial through the bed to the low temperature inner cylinder. Three techniques are developed to find approximate solutions to the heat flux and temperature profiles in the bed. These techniques utilize the diffusion approximation and the P1 and P3 spherical harmonics approximations for radiative transfer. The resulting nonlinear ordinary differential equation associated with each technique is presented, and the method of numerical solution is outlined. Solutions by each technique are presented and compared for a wide range of parameters. An experiment was performed to measure the heat transfer through a packed bed contained between concentric tubes. The entire assembly was enclosed in an electric furnace, and the center tube was held at room temperature by flowing liquid water. The total heat transfer from outer to inner tube was measured between two points interior to the furnace so that axial variation of temperature in the segment of interest was negligible.

• Research Organization: Colorado State Univ., Fort Collins (USA)
• OSTI ID: 5225659
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
ENERGY TRANSFER
HEAT TRANSFER
NUMERICAL SOLUTION
PACKED BED
SPHERICAL HARMONICS METHOD