Week 9 - Parametric study on Gate valve.
AIM
to perform a parametric study on the gate valve simulation by setting the opening from 10 % to 80%.
OBJECTIVES
- Obtain the mass flow rates at the outlet for each design point.
- Calculate the flow coefficient and flow factor for each opening and plot the graph.
- Discuss the results of the mass flow rate and flow coefficient.
GATE VALVE is a device used to control the flow rate through the opening or closing of the gate disc the main parts of the device are
bannet
stem
disc
stuffing box
gasket
flange
packing material
spindle
handle wheel
FLOW COEFFICIENT Cv=Q(SG/P2-P1)^0.5
FLOW FACTOR Kv=0.865*Q(SG/P2-P1)^0.5
I.E Kv= 0.865*Cv
SETUP and MODELLING
THE ABOVE 👆 PIC 105RISE IN THE HEIGHT OF THE DISK
MESHING
SETTING THE PHYSICS OF THE PROBLEM SIMULATION
RESULTS FOR 10% DISC RISE(5mm)
Mass Flow Rate (kg/s)
-------------------------------- -------------------
outlet -0.12391511
Cv=51.219
Kv=44.305
FOR A 20% RISE IN HEIGHT (10mm rise)
Mass Flow Rate (kg/s)
-------------------------------- -------------------
outlet -0.14851221
Cv=77.972
Kv=67.446
FOR 30% RISE IN HEIGHT (15 mm rise)
Mass Flow Rate (kg/s)
-------------------------------- -------------------
outlet -0.18775339
Cv=123.506
Kv=106.88
FOR 40% RISE IN HEIGHT(20mm rise)
Mass Flow Rate (kg/s)
-------------------------------- -------------------
outlet -0.24029579
Cv=173.891
Kv=150.415
FOR 50% RISE IN HEIGHT (25mm rise)
Mass Flow Rate (kg/s)
-------------------------------- -------------------
outlet -0.29635225
Cv=214.572
Kv=185.605
FOR A 60% RISE IN HEIGHT (30 mm rise)
Mass Flow Rate (kg/s)
-------------------------------- -------------------
outlet -0.32455025
Cv=281.291
Kv=243.317
FOR 70% RISE IN HEIGHT (35 mm rise)
Mass Flow Rate (kg/s)
-------------------------------- -------------------
outlet -0.35946853
Cv=350.8317
Kv=303.4764
FOR 80% RISE IN HEIGHT (40 mm rise)
Mass Flow Rate (kg/s)
-------------------------------- -------------------
outlet -0.53252022
Cv=402.6988
Kv=348.3345
CONCLUSION
AS THE GATE VALVE DISC RAISED UP THE RATE OF MASS FLOW THROUGH IT INCREASED AND THE FLOW COEFFICIENT AND FLOW FACTOR TOO SINCE THE MASS FLOW RATE IS DIRCTLY PROPOTIONAL TO FLOW FACTOR AND FLOE COEFFICIENT