Paresh Gujarati

10 Questions 14 Answers 0 Followers

Questions related from Paresh Gujarati

What is the significance of thermal penetration depth and how to calculate it?

What is the significance of thermal penetration depth considering study of pulse tube cryocooler? How to calculate it? At which temperature and pressure one need to calculate thermo-physical...

02 May 2016 9,572 1 View

How might I determine the porosity of a wire mesh screen filled tube?

How do we determine the porosity of a wire mesh screen filled tube with theoretical calculations?

09 June 2015 5,041 1 View

What is the difference between charged pressure and mean pressure for cryocoolers?

I normally read the terms viz. charged pressure and mean pressure while browsing cryocoolers research papers. I do not understand what is the actual difference between them? How do both differ...

19 September 2014 1,526 4 View

How to solve instability issue of a numerical code based on finite volume method?

I am doing numerical modeling of pulse tube cryocooler (with oscillating pressure and temperature) with finite volume method. I have successfully implemented it with implicit scheme by use of...

21 August 2014 1,273 33 View

What is the difference between flow coefficient and discharge coefficient for a needle valve?

I will be using a needle valve for my practical setup of project work. It is based on pulse tube cryocooler. I need to calculate the coefficient of discharge for needle valve for report purpose....

24 May 2014 4,624 6 View

Can we use the shooting method for first order equations?

I am currently doing numerical analysis of GM type Pulse Tube Cryocooler. Governing equations are a system of boundary value problems and one need to use shooting method to solve it (as per one...

14 March 2014 1,445 1 View

Why does helium behaves almost as an ideal gas at 50 K and above temperature at moderate pressure?

Why does helium behaves almost as an ideal gas at 50 K and above temperature at moderate pressure? What is the factor that decides 50 K temperature limit for ideal gas behavior?

30 September 2013 8,141 6 View

How to find shear strength of a material (SS 304)?

I want to use shear strength data of SS 304 for one application. How do we know how much strength any material possess in shear? How one can get the shear strength data of any material?

28 September 2013 6,684 5 View

Pressure boundary condition for pulse tube cryocooler?

I would like to know the meaning of d2P/dx2 = 0 which is the pressure boundary condition for oscillating machine i.e. GM Type pulse tube cryocooler. I want to know, how to deal with these pressure...

31 August 2013 2,242 2 View

Why does pressure ratio in GM type pulse tube cryocooler decrease as the temperature decreases?

I am working on GM type pulse tube cryocooler and I have found that pressure ratio decreases along with the temperature reduction. I do not know what is the reason. As the temperatures goes down...

10 August 2013 3,807 3 View