Showing papers on "Volume of fluid method published in 1979"

Doppler method of measuring flow

Abstract: A method of determining the volume flow of a fluid through a conduit usable with a single crystal, whereby at least one of the fluid and the conduit have energy-scattering interfaces. The method in one embodiment includes transmitting a known, uniform sound field through the fluid which illuminates the entire cross-sectional area of the conduit, obtaining the Doppler signal from the received signal such that the sampling region is normal to the direction of propagation of the sound field; and obtaining the integral of the power over this surface. A known volume of fluid totally within the conduit is then sampled for the reference power return therefrom and this reference power return is divided into the first moment of the power to produce a signal proportional to the volume flow of the fluid through the conduit.

Experiments on Free Surface Phenomena

Abstract: This paper reviews an experimental program in which predictions from domain perturbation theory for motions which perturb the rest state are used in conjunction with experimental measurements on free surface deformations associated with the Weissenberg effect at low rates of shear to obtain values for certain rheological parameter. The experiments include free surface measurements on a liquid near a circular rod rotating in steady motion and oscillatory motion in a large volume of fluid, secondary flows and circumferential velocity measurements in steady rod climbing, normal stress amplification effects, and free surface shapes on a fluid confined between rotating cylinders. Temperature effects are noted, and interesting instability phenomena at high rates of shearing are demonstrated.

Radial piston fluid translating device with power conserving scavenging means

Abstract: In a pump or fluid motor (11, 11a, 11b) having a closed chamber (57) in which cylinders (38) orbit and reciprocate, leakage and cooling fluid which accumulates in the chamber (57) is formed into a rotating annular volume by centrifugal effects and exhibits a higher pressure in the region where the cylinders (38) move radially inward and closer together than in the opposite region where the cylinders (38) move outward and further apart. Power wastage from drag torque, turbulence and heat generation is reduced by scavenging the accumulated fluid from the chamber (57). Internal recirculation of the scavenged fluid from the high pressure portion of the annular rotating volume back to the low pressure portion is avoided by communicating the drain passages (68, 68a, 68b) with only a limited relatively high pressure sector of the rotating volume of fluid.

Double action pump

Abstract: A two-stage pump is illustrated of the type employing a piston having two diameters, one capable of providing a large volume of fluid flow at low pressure so as to move a fluid operated press rapidly until a load is encountered, at which time fluid is delivered at a low volume at high pressure for operation of the press wherein the flow control means are positioned in a piston housing independent of the piston.