Heat transfer enhancement in dense suspensions of agitated solids. Part II: Experiments in the exchange limit

We test the theory of Part I in the exchange limit by vibrating acrylic and aluminum spheres in a box consisting of two flat, vertical isothermal walls, two bumpy, horizontal, insulated walls, and two flat vertical insulated surfaces. The steady heat flux through the thermally-guarded hot wall is recorded at different temperatures of the opposite wall cooled by thermoelectric modules, and enhancements of suspension conductivity are calculated using a lumped-parameter model of the box. To compare results and theory, we also predict vertical profiles of agitation and solid volume fraction in the box using granular dynamics.