The fluid physics module design

A brief description of the fluid physics module (FPM) to be flown aboard Spacelab is given. The FPM consists of two disks that can be rotated at the same or different speeds in either direction and which can be moved laterally and oscillate, separated by a floating zone. The module was designed to meet very strict weight and volume requirements. The supporting structure consists of an Mg-alloy casting. Movements are supplied by small, electronically controlled dc motors with built-in reduction gears. Visualization is accomplished by two lighting systems; (1) a transparency lighting system for displaying the outside shape and fluid movement in planes normal to the axis of rotation, and (2) a system for displaying motion in the plane normal to the transparency system axis. A test chamber cleaning system operates with forced air circulation.