Results 261 to 270 of about 3,868,108 (302)

Energy losses in flow through stenosed valves

Journal of Biomechanics, 1979
Abstract A theoretical analysis yields equations for the calculation of rates of mechanical energy loss in unsteady flow, both within a stenosed valve and in the turbulent mixing region which occurs downstream of the valve. Losses within each of the two regions can be determined by subtraction of the mechanical energy terms at inlet and outlet, but ...
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Flowing Gels for Loss Circulation Prevention

SPE Kingdom of Saudi Arabia Annual Technical Symposium and Exhibition, 2017
Abstract Loss circulation is a common problem in drilling operations. It is a problem in which not only the valuable drilling fluid is lost, but also time and money accompany those losses. In order to mitigate this problem various loss circulation materials (LCMs) are being used all over the world.
M. D. Hashmat, Abdullah S. Sultan, Saifur Rahman, S. M. Hussain, Shaikh Asrof Ali   +4 more
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Excess pressure losses in capillary flows

The Canadian Journal of Chemical Engineering, 1993
AbstractAccurate determinations of excess pressure losses at the entry and exit of capillary flows are essential for rheological characterization of fluids by capillary viscometry. A modification of Bagley's end correction method is presented which accounts for the effects of slight variations in the diameters of the tubes of varying length used in the
W. Kozicki, P. Q. Kuang
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Controlling nitrogen flows and losses

2004
This book is a synthesis of contributions drawn from the 12th Nitrogen Workshop held at the University of Exeter, UK. It provides a valuable compilation of current research, aimed at reconciling the environmental and economic components of Nitrogen cycling within the context of a productive agricultural industry.
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Unraveling Performance Losses in Flow Batteries

ECS Meeting Abstracts, 2011
Abstract not Available.
Thomas A. Zawodzinski, Tang Zhijiang, Doug Aaron, Jamie S. Lawton, Robert M. Counce, Mark Moore, Jack Watson, Matthew Mench, Alexander Papandrew   +8 more
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Junction losses in open channel flows

Water Resources Research, 1979
The energy balance of spatially varied flows at the junction of a rectangular open channel and a side channel is investigated by a one‐dimensional flow analysis of experimental data obtained from a laboratory channel system. By means of a large control volume enclosing the neighborhood of the junction and having the control surface located at the cross
J. D. Lin, H. K. Soong
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Exit loss in viscous tube flow

Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, 1986
Numerous errors abound in the perception and calculation of gas flow in short tubes. This paper will develop modified equations for short-tube viscous flow in circular tubes with either a choked or a nonchoked exit. Several practical examples will be presented for vacuum component and system analysis.
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Exit Flows and Hydraulic Losses

2016
In order to calculate and enhance the system efficiency of a Pelton turbine, it is essential to know which hydraulic and mechanical losses exist and how they can be estimated and above all successfully reduced. The efficiency of a Pelton turbine has so far been almost exclusively determined through measurements which are either restricted to ...
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Flow losses in dry sandy channels

Journal of Geophysical Research, 1961
Statistically significant losses of water are shown to occur in the Canadian River near Oklahoma City. Since classical routing methods are based upon the principle of no volume loss, Kohler routing templates which use K and lag have been modified to create losses and yet prevent rounding of the crest of the outflow hydrograph.
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Expansion Losses in Two-Phase Flow

Nuclear Science and Engineering, 1961
Four methods are discussed for predicting the change of static pressure across an abrupt expansion for the flow of liquid vapor mixtures. Design equations are given and recommendatlons are made for boiling reactor calculations. (auth)
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