ABSTRACT
In this chapter, the experimental techniques will focus on the combined use of particle image velocimetry (PIV) and planar laser-induced fluorescence (PLIF). PIV measures the spatial distribution of fluid velocity, whereas PLIF is used to acquire temperature data in a flow field. The combined PIV-PLIF method offers certain advantages over standard methods of anemometry for experimental studies of entropy production. Previous methods, limited by single-point measurement techniques, can only measure single-point entropy production or averaged entropy production over a finite volume. On the other hand, PIV-PLIF methods provide whole-field methods, while allowing nonintrusive and time-varying measurements of the instantaneous velocity and temperature distributions within a flow field. This chapter presents a detailed description of methods to collect physical data on the detailed structure of entropy production throughout a flow field. The PIV and PLIF techniques provide multipoint instantaneous data, so they enable measured data for local variations of the entropy production rates. In this chapter, the experimental techniques will give whole-field measurements of entropy production with these nonintrusive, optical methods.
