Abstract
M.Ing. (Mechanical Engineering)
Shell and tube heat exchangers are commonly used in industrial processes. In the heat
exchangers the tubes incur flow induced vibrations. These vibrations lead to fretting on the
perimeter of the tube at the baffle plates and to fatigue failure at the tube sheets. Various
studies were and are done to qualify and quantify these vibrations. This is then used to
develop design criteria and methods for lowering the vibration amplitudes of the tubes.
In the thesis the response of a tube bundle in cross flow is shown. The effect of increasing
cross flow velocity on the vibration amplitude of the tubes is determined in a low speed wind
tunnel. The results show similarity to the work done by Gorman [27].
By raising the natural frequency of the tubes in the first row upstream it is shown that the
vibration peaks exhibited by the unmodified model.at cross flow velocities lower than the
critical flow speed do not materialize in the modified tube bundle. This modification can be
implemented by decreasing the unsupported length of the tubes in the first row.
The inclusion of fluid damping when calculating the total damping of the tubes according to
Blevins [24] is shown in the experiment. From experimental results it is shown that the
prediction of the critical velocity according to Blevins [24] results in a better prediction of this
velocity.
Numerical solutions of two dimensional flow over a single cylinder and a pair of cylinders
are obtained by simulating the flow on the STAR CD flow simulation package. The effect
of neighbouring tubes on one another is determined by qualifying and quantifying the flow
over and the forces on the tubes. The vortex shedding frequency determined from the
simulation coincides with experimental results. This shows great potential in future simulation
of flow over a tube bundle.
A computerised design model is also developed. Themodel determines the vibration potential
of the tube bundle in a shell and tube heat exchanger. If needed, modifications to new
designs and built heat exchangers can be done and the vibration potential is easily determined
with the model. The results of the experimental work are used to further develop the design
criteria preventing detrimental vibrations in heat exchangers.
Promising results to decrease vibration amplitudes of tubes in tube bundles are obtained in
the experiments done. This and the results obtained in the simulation of the vortex shedding
frequencies that coincide with the results in the experimental work, show great potential for
flow simulation and development of methods to decrease flow induced vibrations of tubes in
shell and tube heat exchangers.