Experimental investigation of ionizational nonequilibrium in atmospheric pressure air plasmas

2002 ◽  
Author(s):  
C.O. Laux ◽  
R.J. Gessman ◽  
D.M. Packan ◽  
L. Yu ◽  
C.H. Kruger ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Atmospheric Pressure ◽  
Air Plasmas

Reactive species in cold atmospheric-pressure He+Air plasmas: The influence of humidity

2019 ◽  
Vol 26 (6) ◽  
pp. 063514 ◽  
Author(s):  
Bowen Sun ◽  
Dingxin Liu ◽  
Xiaohua Wang ◽  
Zhichao Liu ◽  
Felipe Iza ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Reactive Species ◽  
Air Plasmas

Heat Transfer in Film Boiling With Pulsating Pressures

1964 ◽  
Vol 86 (3) ◽  
pp. 457-460 ◽  
Author(s):  
D. A. Di Cicco ◽  
R. J. Schoenhals
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Heat Transfer Rate ◽  
High Purity ◽  
Atmospheric Pressure ◽  
Transfer Rate ◽  
Peak Pressure ◽  
Film Boiling ◽  
Periodic Pressure ◽  
Initial Results

The purpose of this exploratory experimental investigation was to determine the effect on the heat-transfer rate when a pulsating pressure is applied to a stable film boiling system. The test section used consisted of a 0.030-in-dia horizontal platinum wire. The boiling medium was monofluorotrichloromethane, C Cl3F, commercially available in high purity as Refrigerant 11. A boiling curve was obtained at atmospheric pressure. In addition, pulsating tests were conducted for various pulsing rates and for three different test wire temperatures. Periodic pressure pulses of approximately 100 psi were applied to the system. The initial results thus far obtained in this investigation show a substantial increase in the heat-transfer rate for pulsing frequencies ranging from 11.3 cps to 25.8 cps. The improvement is noted to be from 59.5 percent to 103 percent above the heat-transfer rate for film boiling at atmospheric pressure at the same temperature difference between the test wire and the fluid. It was also found that the heat-transfer rate achieved was higher than the average of the heat-transfer rate for atmospheric pressure film boiling and that for subcooled film boiling at the peak pressure achieved in pulsing. For the higher pulsing frequencies, the heat-transfer rate was found to be even greater than that for subcooled film boiling at the peak pressure.

Microwave air plasmas in capillaries at low pressure II. Experimental investigation

2016 ◽  
Vol 49 (43) ◽  
pp. 435202 ◽  
Author(s):  
G D Stancu ◽  
O Leroy ◽  
P Coche ◽  
K Gadonna ◽  
V Guerra ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Low Pressure ◽  
Air Plasmas

Experimental Investigation of a Gasoline-to-LPG Converted Engine Performance at Various Injection and Cylinder Pressures with Respect to Propane Spray Structures

2013 ◽  
Vol 315 ◽  
pp. 20-24 ◽  
Author(s):  
Taib Iskandar Mohamad ◽  
Mark Jermy ◽  
Matthew Harrison
Keyword(s):  
Experimental Investigation ◽  
Atmospheric Pressure ◽  
Gasoline Engine ◽  
Imaging Techniques ◽  
Engine Performance ◽  
Power Reduction ◽  
Injection System ◽  
Fuel Injector ◽  
Engine Torque ◽  
Efficiency Increase

Power reduction when converting a gasoline engine to propane can be mitigated by designing an injection system so the heat required for evaporation of the propane is drawn from the intake air. Air is cooled and densified, resulting in volumetric efficiency increase. LPG sprays were imaged using Mie and LIF imaging techniques from a port fuel injector, and from long and short connecting pipes. Images were taken in an optically-accessed pressure chamber at atmospheric pressure and fuel pressures of 1.5 MPa. Images of the pipe-coupled injection spray show significant evaporation in the pipe, whose amount depend on the length and diameter of the pipe. The duration of the LPG pulse at the manifold end is, for 300mm pipes, five times the original duration at the injector, and even greater for 600mm pipes. The narrow sprays and the amount of evaporation that occurs before the fuel enters the manifold explains the differences in engine torque and in-cylinder mixture temperature with the different systems.

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