ABSTRACT
Regardless of the type of cooling fluid, knowledge of the fluid velocity is required for characterization and design of electronic systems. This chapter deals with the process and steps required to measure velocity at different locations of electronic systems and reviews sensors suitable for these types of measurements. Hence, a data acquisition system and a computer are considered to be essential meaningful velocity measurement. Only small amounts of seeding should be added to the water, then thoroughly mixed to get the desired data rate from the laser Doppler velocimeter (LDV) system. The LDV and hot-wire methods allow one to make time-resolved measurements of the velocity, in contrast to the particle image velocimetry technique which provides “snapshots” of the flow field. The first flow field survey would be attempted by traversing the LDV measurement volume in small incremental steps throughout the regions of interest. The seeding density is determined by the desired spatial resolution of the velocity measurement.
