04-03-2011, 11:14 AM
PRESENTED BY:
MUNIR SHARIF
[attachment=9510]
INTRODUCTION
• cryogenic may be define as the branch
Of physics which deals with the production of low temperature and theirEffect on matter.
• It may also define as the science and techonology of temperature below the 120k
• The word “cryo” is derived from a Greek word “kruos” which means cold
METHOD TO PRODUCED LOW TEMPERATURE
• Magnetism produced low temperature. when a material is magnitized it become warm and cold when demagnetized in controlled Atmosphere thus producing low temperatures.
• By compressing the gas, the gas is cooled releasing heat and later allowed to expand producing ultra low temperature.
Cryogenics in fuels
• Fluids are stored at 93.5k(-180) or below
• Due to air friction, it gets ignited
• Cool Engine on expansion.
• On expansion pressure increases providing high thrust.
• Satellite payload is increases
Cryogenics rocket engine
• Cryogenic rocket engine are one of the importein application in the field of cryogenics.
• The higher thrust level required for for a rocket engine are achieved when liquid oxygen and liquid hyderocarbon are used as a fuel.but at atmospheric condition,LOX and low molecular hydrocarbon are in gaseous states. Therefore these are stored in liquid form by cooling them down using cryogenics.hence the name cryogenic rocket engine.
GRINDING
Grinding is one of the most popular finishing processes.
This process is carried out with a grinding wheel made up of grits for removing materials from workpiece surface.
The problems in conventional grinding process:
High heat generation
Introduction of tensile residual stress and micro-cracks occur
High level of surface quality can not be reached
Problems in hard materials.
Less tool life
Sometimes M.R.R. is not satisfactory.
Now… elimination of all those problems are required…
but…
HOW…???
Here comes the introduction of _
C R Y O G E N I C
G R I N D I N G
…also known as Freeze Grinding
How it is done…
The cryogen like liquid nitrogen is applied onto the cutting point mostly in the form of jet. At low temperature (-196°C) of the cryogen, the temperature at the cutting zone is controlled more effectively than the other methods of applying cutting fluid.
Experimental set-up
MUNIR SHARIF
[attachment=9510]
INTRODUCTION
• cryogenic may be define as the branch
Of physics which deals with the production of low temperature and theirEffect on matter.
• It may also define as the science and techonology of temperature below the 120k
• The word “cryo” is derived from a Greek word “kruos” which means cold
METHOD TO PRODUCED LOW TEMPERATURE
• Magnetism produced low temperature. when a material is magnitized it become warm and cold when demagnetized in controlled Atmosphere thus producing low temperatures.
• By compressing the gas, the gas is cooled releasing heat and later allowed to expand producing ultra low temperature.
Cryogenics in fuels
• Fluids are stored at 93.5k(-180) or below
• Due to air friction, it gets ignited
• Cool Engine on expansion.
• On expansion pressure increases providing high thrust.
• Satellite payload is increases
Cryogenics rocket engine
• Cryogenic rocket engine are one of the importein application in the field of cryogenics.
• The higher thrust level required for for a rocket engine are achieved when liquid oxygen and liquid hyderocarbon are used as a fuel.but at atmospheric condition,LOX and low molecular hydrocarbon are in gaseous states. Therefore these are stored in liquid form by cooling them down using cryogenics.hence the name cryogenic rocket engine.
GRINDING
Grinding is one of the most popular finishing processes.
This process is carried out with a grinding wheel made up of grits for removing materials from workpiece surface.
The problems in conventional grinding process:
High heat generation
Introduction of tensile residual stress and micro-cracks occur
High level of surface quality can not be reached
Problems in hard materials.
Less tool life
Sometimes M.R.R. is not satisfactory.
Now… elimination of all those problems are required…
but…
HOW…???
Here comes the introduction of _
C R Y O G E N I C
G R I N D I N G
…also known as Freeze Grinding
How it is done…
The cryogen like liquid nitrogen is applied onto the cutting point mostly in the form of jet. At low temperature (-196°C) of the cryogen, the temperature at the cutting zone is controlled more effectively than the other methods of applying cutting fluid.
Experimental set-up
