Accession Number : AD0621720

Title :   UNCONVENTIONAL METHODS FOR INFLUENCING FLUID FLOW. PART III. THERMAL PLUMBING.

Descriptive Note : Final rept. Oct 63-Apr 65,

Corporate Author : CARNEGIE INST OF TECH PITTSBURGH PA DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : McGowan,Jon G.

Report Date : JUL 1965

Pagination or Media Count : 143

Abstract : Thermal pumping, defined as the conversion of thermal energy (heat) into mechanical pumping energy (flow work) in a device without any moving parts, is examined in detail for four major types of devices. These unconventional pumping devices used the physical effects of capillarity, thermocapillarity, osmosis, or thermo-osmosis to influence the fluid flow through a particular convertor. Each convertor is analyzed using steady-state thermodynamic considerations that restrict the operation of the device to small deviations from equilibrium conditions. This initial analysis enables such performance characteristics as maximum thermal efficiency, optimum flow rates, and maximum pressure rises to be analytically and numerically evaluated for each convertor. For the case of the capillary and osmotic pumping devices the initial performance analysis was extended to allow for arbitrarily large pressure rises through these pumping devices. On the basis of this expanded analysis, a complete numerical study yielded sets of performance curves showing the effect of varying system parameters on the performance of either device. (Author)

Descriptors :   (*FLUID FLOW, PUMPS), (*PUMPS, THERMODYNAMICS), CAPILLARY TUBES, OSMOSIS, ENERGY CONVERSION, SEMIPERMEABILITY

Distribution Statement : APPROVED FOR PUBLIC RELEASE