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Investigation Of Evaporation From Grooved Inverted Meniscus Heat Pipe Wicks, Richard Clarke Oliver

Mechanical Engineering ETDs

The heat transfer process for a special class of wick fed grooved heat pipe evaporators was investigated analytically and experimentally. The heat pipes studied had vapor release slots cut through the evaporator wick to enhance removal of the vapor generated in the evaporator. As a result of the slots, the liquid menisci formed between the groove tips and the transport wick rather than at the base of the grooves as normally observed. This type of heat pipe evaporator is referred to as an inverted meniscus design.

A comprehensive survey of the literature was completed to establish the existing state of …

Lower Bounds To Colunm And Plate Buckling Loads, Pen-Yuan Shih

Mechanical Engineering ETDs

The complexity inherent in the theory of elastic stability has resulted in the extensive use of approximate techniques for determining buckling loads. The Rayleigh quotient provides reasonable answers for a surprisingly broad category of problems. However, the quotient is an upper bound to the buckling load and for certain engineering structures, further it is difficult to estimate the error. A rigorous and conservative analysis requires that a lower bound be computed.

There are several techniques for finding lower bounds to eigenvalues but because of various complicating factors none is routinely used for elastic stability analyses. The purpose of this dissertation …

Heat Transfer In Beaded Thermocouples Mounted On Solid Substrates-- Application To Transient Measurement Errors, Karl Wally

Mechanical Engineering ETDs

Beaded thermocouples mounted on the surface of a solid for the purpose of measuring surface temperature are liable to introduce measurement errors as a result of heat transfer between the surface and the bead, and also because of the thermal inertia of the bead. For the prediction or correction of such errors, an accurate model of the thermocouple response is required. This paper uses a solution technique known as Quasi-Coupling to solve for the heat transfer in idealized beaded thermocouples mounted on idealized solids. The parameters controlling the thermocouple response are identified and the sensitivity of the response to these …