Analogy Between Mass and Heat Transfer with Turbulent Flow

An analysis of combined heat and mass transfer from a flat plate has been made in terms of Prandtl t s simplified physical concept of the turbulent boundary layer. The results of the analysis show that for conditions of reasonably small heat and mass transfer, the ratio of the mass-and heat-transfer coefficients is dependent on the Reynolds number of the boundary layer, the Prandtl number of the medium of diffusion, and the Schmidt number of the diffusing fluid in the medium of diffusion. For the particular case of water evaporating into air, the ratio of mass-transfer coefficient to heat-transfer coefficient is found to be slightly greater than unity

Nest and Prey of \u3ci\u3eAgeniella (Leucophrus) Fulgifrons\u3c/i\u3e (Hymenoptera: Pompilidae)

Information on the habitat, nest-site, hunting, prey transport, closure, burrow structure, and prey of Ageniella (Leucophrus) fulgifrons is presented. Components of the nesting behaviors of other species of Ageniella are examined and compared with those of A. fulgifrons

Northern Distribution Records for Some Nearctic Pompilidae (Hymenoptera)

Distributional records and nomenclatural changes are presented for 20 species of Nearctic Pompilidae. The records extend the species\u27 ranges northward in North America, are peripheral on the northern boundaries of the ranges, or fill in sizeable gaps in the distributions. Flower records, habitat notes, and remarks on the prey are given for some of the species

A Method for Rapid Determination of the Icing Limit of a Body in Terms of the Stream Conditions

The effects of existing frictional heating were analyzed to determine the conditions under which ice formations on aircraft surfaces can be prevented. A method is presented for rapidly determining by means of charts the combination of-Mach number, altitude, and stream temperature which will maintain an ice-free surface in an icing cloud. The method can be applied to both subsonic and supersonic flow. The charts presented are for Mach numbers up to 1.8 and pressure altitudes from sea level to 45,000 feet

A comparison of silent reading and listening through written recall and multiple choice type tests; grades 6 and 7.

Thesis (Ed.M.)--Boston Universit