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Questions related from Paresh Gujarati
We know that entropy is associated with every matter. Can it be associated with the expansion of the universe too? Is there any spiritual angle associated with the entropy and universe expansion?
08 September 2020 9,909 6 View
Normally one can found orifice with buffer volume/reservoir as phase shifter in low frequency crycoolers like GM Cryocooler and GM Type pulse tube cryocooler. But in Stirling type pulse tube...
15 September 2016 6,291 2 View
Currently I have prepared a circuit which gives me constant current source of 10 micro ampere. 2 Volt DC source and 200 k Ohm resistor in series. What if the output volt of DC power supply...
01 June 2016 1,665 4 View
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 9,612 1 View
I have Silicon diode Si 410 which will measure very low temperature from 300 K to 4 K. I will be using LabVIEW data acquisition system. As the Silicon diode is RTD, it needs excitation current....
14 April 2016 1,786 4 View
In GM type pulse tube cryocooler, Helium compressor is generally of non reciprocating type. I would like to know how to calculate the PV power of GM helium compressor?
12 September 2015 405 1 View
How do we determine the porosity of a wire mesh screen filled tube with theoretical calculations?
09 June 2015 5,072 1 View
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 1,571 4 View
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 1,319 33 View
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 4,658 6 View
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 1,482 1 View
How to print variable column wise for different constant value of independent variable? I am printing the temperature as a function of different velocity. See the figure which shows the format. I...
14 February 2014 982 1 View
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 8,177 6 View
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 6,718 5 View
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 2,281 2 View
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 3,848 3 View
