Acoustic nonlinearity of a circular orifice: An experimental study of the instantaneous pressure/flow relationship

1998 ◽  
Vol 46 (3) ◽  
pp. 97 ◽  
Author(s):  
N. S. Dickey ◽  
A. Selamet
Keyword(s):  
Experimental Study ◽  
Pressure Flow ◽  
Acoustic Nonlinearity ◽  
Circular Orifice ◽  
Instantaneous Pressure

Forced and Periodic Vortex Breakdown

1967 ◽  
Vol 89 (3) ◽  
pp. 609-615
Author(s):  
Turgut Sarpkaya
Keyword(s):  
Experimental Study ◽  
Opposite Direction ◽  
Vortex Tube ◽  
Vortex Breakdown ◽  
Swirling Flow ◽  
Typical Data ◽  
Circular Orifice ◽  
Pros And Cons

The results of an experimental study of the forced and periodic breakdown of a confined vortex rotating in the opposite direction are presented. The vortex tube consists of two chambers connected by a short conduit through streamlined transitions. The upstream end is closed by a plain wall, and a circular orifice is provided at the downstream end. The swirling flow and the breaker-vortex are generated by introducing varying proportions of air or water through tangential ports located near the upstream and downstream walls of the unit. The cases of single breakdown and periodic breakdown are explored and typical data are presented for each case. Finally, the pros and cons of the two existing transition theories are discussed.

Pulsatile and Steady Pressure-Flow Relations in the Vascular Bed of the Hind Leg of the Dog

1956 ◽  
Vol 185 (2) ◽  
pp. 351-354 ◽  
Author(s):  
James E. Randall ◽  
Ralph W. Stacy
Keyword(s):  
Measurement Accuracy ◽  
Static Pressure ◽  
Dynamic Pressure ◽  
Flow Diagram ◽  
Pressure Flow ◽  
Pulsatile Pressure ◽  
Instantaneous Pressure ◽  
Flow Diagrams ◽  
The Mean ◽  
The One

Instantaneous pressure and flow in the femoral artery of the dog were recorded under steady and pulsatile pressure conditions. Static pressure-flow diagrams and dynamic pressure-flow diagrams over the pulse pressure range at different points in the cardiac cycle were constructed. A comparison was made of the flow corresponding to a) normal pulsatile conditions, and b) static pressures equal to the mean of the pulsatile pressures. The static pressure-flow diagrams were consistent with those described by other workers, and were essentially linear in the ranges studied. Changing from steady to pulsating pressures altered the flow from 40.4 ml/min. to 40.9 ml/min. This difference was less than the measurement accuracy of the flow, although statistical analysis indicated significance to 1%. The dynamic pressure-flow diagram appeared as a ‘loop,’ the shape of which indicated that in 12 of 13 animals, the system was mass controlled and the heart rate was higher than the resonant frequency. In the one exception, the phase angle was negligible and the system was apparently in resonance.

Experimental Study of Non-Contact Robot Gripper for Food Industries

2012 ◽  
Vol 232 ◽  
pp. 392-397 ◽  
Author(s):  
N. Elango ◽  
Nneka Obianuju Onubogu ◽  
S. Ragunathan
Keyword(s):  
Experimental Study ◽  
Coanda Effect ◽  
Pressure Flow ◽  
Food Industries ◽  
Robot Gripper ◽  
Coandǎ Effect

A new gripping principle, based on Coanda effect was applied successfully in designing and developing a non contact robot gripper to curb the gripping challenges faced in the food industries. Two designs of the non contact grippers/ejectors which are working on Coanda effect are presented in this paper. The first design was made with one suction head while the second design was made with multiple suction heads. Experiments were carried out on both ejectors to observe their holding force on food materials as a function of mainly the pressure, flow of the primary air and other parameters. Tangible results were derived from the experiments, tabulated and shown in graphical forms; from which relationships between the parameters were derived. When tested on thick bark/packed food materials, they left no suction marks on them.

scholarly journals Instantaneous pressure-flow velocity relations of systemic venous return in patients with univentricular circulation

Heart ◽  
1999 ◽  
Vol 82 (3) ◽  
pp. 294-299 ◽  
Author(s):  
R Kaulitz ◽  
P Bergman ◽  
I Luhmer ◽  
T Paul ◽  
G Hausdorf
Keyword(s):  
Flow Velocity ◽  
Venous Return ◽  
Pressure Flow ◽  
Systemic Venous Return ◽  
Instantaneous Pressure
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