ON ISOTHERMAL FLOW OF AIR INTO A PARTIALLY CASED RECTANGULAR SNOW TRENCH,
Abstract
In a previous paper, Yen and Fisher (PB-167 436) developed an expression for evaluating the quantity of air flowing into a partly cased rectangular porous trench of constant permeability. The flow was assumed to be isothermal, steady and two-dimensional. The formula is Q = 2 (K sub 1'/2 K sub 1) (K/mu) (rho sub avg) (P sub s - P sub w), where Q is the mass flow rate per unit length of the trench, K sub 1'/2 K sub 1 is a configuration factor; k is permeability, mu is viscosity of air; rho sub avg is the average density at mean pressure; and p sub s and p sub w are the air pressures at the trench top and the uncased trench walls respectively. The configuration factor in this earlier work was arrived at by considering the effects of depth to the impermeable layer, d sub l, depth of the trench, d sub t, and depth of the trench casing, d sub c. In the present study, however, values of K sub 1'/2 K sub 1 were determined which included the effect of half trench width b as well as d sub l, d sub t and d sub c. It is found that in any practical analysis the effect of trench width is not negligible and should be considered. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1965
- Accession Number
- AD0622193
Entities
People
- Yinchao Yen
Organizations
- Cold Regions Research and Engineering Laboratory