i) Compressibility of the vapour phase from the tube fluid that
has flowed into the shell-side ðVg=c2g
rgÞ dP assuming
changes in vapour pressure are isentropic (where cg is the
isentropic speed of sound of the vapour phase).
ii) Compressibility of the liquid phases 1 and 2 (assuming that
there could be two phases, eg. Hydrocarbon liquid, and free
water) from the tube fluid that has flowed into the shell-side
( VL1/BL1 þ VL2/BL2) dP assuming changes in liquid pressure
are adiabatic (where BL1 and BL2 are adiabatic bulk moduli of
the two liquid phases, respectively).
iii) Compressibility of the cooling or heating fluid already in the
shell (Vf/Bf) dPassuming changes in liquid pressure are
isothermal (where Bf is the isothermal bulk modulus of the
shell fluid).
iv) Elastic compliance of the shell material (Vshell/Kshell) dP,
where Kshell is the isothermal shell compliance determined