Ph.D. Course Work

1. JOULE -THOMSON COOLING EFFECT
Presented By
Md. Shahanawaj Ansari
[Ph.D. Course Work]
Dr. C.V. RAMAN UNIVERSITY ,KOTA,BILASPUR (C.G.)

2. WHAT IS JOULE- THOMSON EFFECT ?
# Change in temperature of a gas occurs when its
pressure changes suddenly through a valve or
porous plug.
# This phenomena was first observed by James
Joule and Thompson in 1852. Hence it is called
JOULE-THOMSON EFFECT
Dr. C.V. RAMAN UNIVERSITY ,KOTA,BILASPUR (C.G.)

3. SCHEMATIC DIAGRAM
Dr. C.V. RAMAN UNIVERSITY ,KOTA,BILASPUR (C.G.)

4. THROTTLING OF REAL GAS
Dr. C.V. RAMAN UNIVERSITY ,KOTA,BILASPUR (C.G.)

5. CONDITIONS FOR JOULE- THOMSON EFFECT
# System should be insulated
# It is an adiabatic process
# Exchange of heat, Q=0
# Pressure should fall rapidly
Dr. C.V. RAMAN UNIVERSITY ,KOTA,BILASPUR (C.G.)

6. MATHEMATICAL FORMULA FOR JOULE –THOMSON EFFECT
H = U + PV
H= Enthalpy
P= Pressure
V= Volume
U= Internal Energy
# Total enthalpy of the real remains constant.
Dr. C.V. RAMAN UNIVERSITY ,KOTA,BILASPUR (C.G.)

7. JOULE -THOMSON CO-EFFICIENT
Dr. C.V. RAMAN UNIVERSITY ,KOTA,BILASPUR (C.G.)

8. APPLICATIONS OF JOULE-THOMSON EFFECT
#In refrigerator as cooling
# In petro-chemical Industry used to
liquefy the gases
# In cryogenic engines to liquefy
nitrogen and oxygen gases
Dr. C.V. RAMAN UNIVERSITY ,KOTA,BILASPUR (C.G.)

9. CONCLUSION
# It describes the enthalpy of the
gases.
# It supports the principle of
conservation of energy
# Heat-Pump engines are developed
due to this effect.
Dr. C.V. RAMAN UNIVERSITY ,KOTA,BILASPUR (C.G.)

10. Dr. C.V. RAMAN UNIVERSITY ,KOTA,BILASPUR (C.G.)
THANK YOU