SHELL AND TUBE HEAT EXCHANGERS
SHELL AND TUBE HEAT EXCHANGERS
(OP)
COULD YOU HELP WITH A CHEMICAL ENGINEERING PROBLEM
1. GASEOUS FLOW
2. AS OPERATING PRESSURE RISES, GAS DENSITY INCREASES CORRECT?
3. PRESSURE DROP IS DIRECTLY PROPORTIONAL TO SQUARE OF MASS VELOCITY ?
4. INVERSELY PROPORTIONAL TO DENSITY ?
PLEASE BRIEFLY OUTLINE YOUR REASONING, ESPECIALLY FOR 4
THANK YOU
1. GASEOUS FLOW
2. AS OPERATING PRESSURE RISES, GAS DENSITY INCREASES CORRECT?
3. PRESSURE DROP IS DIRECTLY PROPORTIONAL TO SQUARE OF MASS VELOCITY ?
4. INVERSELY PROPORTIONAL TO DENSITY ?
PLEASE BRIEFLY OUTLINE YOUR REASONING, ESPECIALLY FOR 4
THANK YOU





RE: SHELL AND TUBE HEAT EXCHANGERS
3. Yes. ΔP=f(L/D)(ρv2/2)
4. No. ΔP=f(L/D)(ρv2/2) DIRECTLY PROPORTIONAL TO DENSITY, but if the equation is written in terms of mass velocity (ρv), it may appear to be so. ΔP=f(L/D)((ρv)2/(2ρ)
Good luck,
Latexman
Technically, the glass is always full - 1/2 air and 1/2 water.
RE: SHELL AND TUBE HEAT EXCHANGERS
RE: SHELL AND TUBE HEAT EXCHANGERS
RE: SHELL AND TUBE HEAT EXCHANGERS
For gas flow in ducts with usual Reynolds number in the range 100,000 to 500,000 and friction factor f=1/200, the fricion drop is estimated from:
This empirical equation shows what happens at constant mass flow rate from the effects of a drop in density ρ and the resulting increased velocity v.
The pressure drop would increase, but the density is still proportional to ΔPf.