STUDYING THE EFFECTS OF VELOCITY AND COEFFICIENT OF FRICTION IN WATER HAMMER CALCULATIONS

A system of tank and pipe with valve was studied by the computer program that was prepared to calculate water hammer equations in a previous published paper by the first researcher. Almost 50 table of results gained after running the program with different values of velocities and coefficient of friction. The values of head, was studied very well to get several notes about this noisy phenomenon.  Generally, the curve layout for the results of the water hammer is almost constant, except for a slight difference.  With the stability of the speed and the change of coefficient friction, we found that the results of the head at one point for example, in the middle of the distance between the tank and the valve, are variable and decrease with the high coefficient of friction.  Values of time in the tables will be decrease when increasing of velocity, nearly between 91- 93%.  The values of head after running the program, when the valve is initially closed for any speed with constant coefficient of friction is almost constant despite the change of speed and to certain limits, changes in head values start within the limits of the seventh and eighth points of time values and the head values are lower for the higher speed.