THEORETICAL AND EXPERIMENTAL STUDY OF A SHOCK TUBE PERFORMANCE WITH HOMOGENEOUS NUCLEATION OF WATER VAPOUR | ||||
| ERJ. Engineering Research Journal | ||||
| Article 10, Volume 24, Issue 3, July 2001, Page 127-145 PDF (716.17 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/erjm.2001.71055 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| N. H. MAHMOUD | ||||
| Department of Mechanical Power Engineering, Faculty of Engineering, Minoufiya University, Shebin El-Kom, EGYPT. | ||||
| Abstract | ||||
| Performance characteristics of a shock tube has been investigated here theoretically and experimentally when the homogeneous nucleation appears in the expansion fan within the driver section. Nucleation of water vapour is simulated using the nonisothermal formulation of the classical theory of nucleation. Shock tube performance is represented with the aid of an analytical model combines its pressure ratios. A modified shock tube equipped with a convergent section of different geometries and joined the driven section to the tail pipe is used in the present experimental program. Pressure traces ahead and behind the convergent section are measured using three pressure transducers. Both measurement and prediction of shock tube flows show the dependence of the pressure ratio across the incident moving shock wzve in the driven section on the tube overall pressure ratio. It is noted also from the prssent predictions the pronounced effect of the shock tube overall pressure ratio on the nncleation characteristics (i.e., amount of subcooling, supersaturation ratio, critical size of nucleated droplets and rate of nucleation) of the water vapour in the driver section. The validity of the suggested model is tested by comparing between the predicted and measured pressure ratios. Another comparison has been carried out between the calculated values of the nucleation rate in a shock tube and the published measured ones. The two cornparisoils indicate reasonable agreements | ||||
| Keywords | ||||
| Water vapour; Condensation; shock tube; nucleation; shock wave; rarefaction wave; expansion fan | ||||
|
Statistics Article View: 88 PDF Download: 137 |
||||
