Numerical Study of Formation of Thermal Non Uniformities in Active Packed Beds.
Abstract
The purpose of this work was to mathematically model the heat transfer in an active bed heat exchanger and to develop an appropriate numerical scheme for the solution of the temperature field. As active packed beds are being considered for use in nuclear reactors, concern is generated as to whether regions of relatively high temperatures will develop. Such concern is the impetus behind the application of the program to two applications concerning heat transfer in packed beds assuming variable porosity of the Brosilow type and the existence of blockages. The results show that for the case of a packed bed with the porosity distribution the so-called hot spot occurs near the wall of the bed. Its magnitude and position were seen to be strongly affected by the assumed velocity profile and wall boundary conditions. In addition, as the proposed mathematical equations include axial conduction as opposed to a previously developed program which excluded axial conduction and as the results of the two programs approached one another as the Re increased, it is reasonable that the previous program (as it is based on parabolic, not elliptic equations as in the present case) could be implemented with little error expected due to the lack of axial conduction.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1978
- Accession Number
- ADA085861
Entities
People
- J-m. Buchlin
- Myron Hill
Organizations
- von Kármán Institute for Fluid Dynamics