*Forma,* Vol. 10 (No. 2), pp. 109-118, 1995

*Original Paper*

## Deformation of a Liquid Drop Due to Rotation.

II. Hydrodynamical Analysis of the Velocity Field at Relatively Low Rate of Rotation

Osamu Sano

Department of Applied Physics, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183, Japan

(Received April 11, 1995; Accepted June 21, 1995)

**Keywords: **
Rotating Drop, Surface Tension, Coriolis Force, Navier-Stokes Equation, Internal Velocity Field

**Abstract. **
A theoretical model of the velocity field in a rotating spherical drop in an otherwise quiescent fluid of different viscosity is presented. We assume that the drop rotates steadily at a low angular velocity by an external torque. The velocity field inside the drop is calculated on the basis of the Navier-Stokes equation, and is compared with our previous experiment. A deviation of internal fluid motion from that of a rigid-body rotation is derived by taking account of the Coriolis force associated with the circulatory flow in the meridian plane.