Analyzing the Pressure Response during the Afterfl ow Period: Determination of the Formation Permeability and Skin Factor

2015 ◽  
pp. 95-102
Keyword(s):  
Pressure Response ◽  
Skin Factor

Determination of Flow Rate Characteristics of Pneumatic Solenoid Valves Using an Isothermal Chamber

2004 ◽  
Vol 126 (2) ◽  
pp. 273-279 ◽  
Author(s):  
Kenji Kawashima ◽  
Yukio Ishii ◽  
Tatsuya Funaki ◽  
Toshiharu Kagawa
Keyword(s):  
Heat Transfer ◽  
Critical Pressure ◽  
Pressure Ratio ◽  
Pressure Change ◽  
Pressure Response ◽  
Heat Transfer Area ◽  
New Methods ◽  
Upstream Pressure ◽  
Pneumatic Valves

In this paper, two new methods for obtaining the sonic conductance and the critical pressure ratio of pneumatic valves are proposed. Both methods use a chamber that can approximate isothermal conditions. This was achieved by filling the chamber with metal wire, which creates a larger heat transfer area and heat transfer coefficient. The sonic conductance and the critical pressure ratio are obtained by measuring the pressure in the chamber during charging and discharging. These methods take only seconds to perform and require less energy than the ISO 6358 procedure. The major factor in the error for the pressure response during the charging of the isothermal chamber is the upstream pressure change. Nevertheless, the sonic conductance can be determined within a 3% uncertainty. In addition, the sonic conductance calculated from the pressure response during the discharging of the chamber can be determined within a 1.2% uncertainty.

Determination of Flow Rate Characteristics for Pneumatic Components During Isothermal Discharge by Integral Algorithm

2012 ◽  
Vol 134 (6) ◽  
Author(s):  
Tao Wang ◽  
Ling Zhao ◽  
Tong Zhao ◽  
Wei Fan ◽  
Toshiharu Kagawa
Keyword(s):  
Flow Rate ◽  
Pressure Sensors ◽  
Pressure Response ◽  
Experimental Result ◽  
Rate Characteristic ◽  
Flow Rate Characteristic ◽  
Discharge Method ◽  
Measured Pressure ◽  
Error Method

In this paper, we proposed a method to determine the flow rate characteristic parameters directly by using an integral algorithm which is not needed to calculate the flow rate. In the isothermal discharge method discussed by ISO, the flow rate characteristics of pneumatic components can be obtained by pressure response and flow rate. The pressure response is measured in an isothermal tank and the flow rate can be given by differentiating the measured pressure response. Because of using the differential algorithm, calculation precision for measurement error and distribution is much poorer. By integrating pressure experimental result with least error method, characteristics can be obtained easily with Excel tool. Some experimental results are given to show that the proposed calculation method in this paper is more effective than the conversational method by using pressure sensors with different precision.

Sign in / Sign up

Export Citation Format

Share Document