  We study the axial flow of a nonviscous and incompressible fluid in a
circular tube made from an electromechanical material. The tube is driven into
radial motion by an electric voltage across its thickness. A theoretical
analysis is performed. An analytical solution is obtained from the relevant
equations of fluid mechanics and piezoelectric shells. The solution shows that
when the tube is contracting or expanding radially under a properly designed
voltage, the fluid can flow along the tube axially. Hence the tube can function
as a pump for driving the fluid. The effects of various physical parameters on
the velocity profile of the flow are examined.
