الفهرس 
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Abstract
The objective of this research is to study the
behavior the two phase refrigerant-oil mixture
during the compression process in screw compressors.
The effect of the rate of oil injection on the
pressure and temperature distribution was
investigated theoretically. The theoretical
treatment starts from the consideration of the basic
governing equations of the momentum and energy
transfer of a two phase mixture. The;-’mixture is
assumed as a homogeneous fluid with physical
properties different from those separat for the
oil and the refrigerant. An integral method was used to
solve the momentum and energy equations and the
effect, of not only the oil concentration in the
refrigerant but also the location of the injection
point on the pressure and temperature distribution and
the energy required for the compression were ail
investigated.
In a commercial screw compressor, the space in
which the compression process takes place has a
complicated geometrical profile. Therefore, a special
chapter was devoted to explain the possible profiles
for the male and female teeth of the rotors, and the
limitations of the design of these profiles.
An experimental test rig was built. Essentially
it is a refrigerating cycle which consists of two