Mechanical Engineering Seminar - Dr. Anthony Jacobi
Falling-film flows, heat transfer, and potential advances in solar desalination
A liquid film falling between horizontal tubes is known to manifest three main flow regimes or modes. In the droplet mode, liquid falls from the tubes as droplets impinging on the tubes below. At increased flow rates, the liquid departs from regularly spaced sites as a continuous, steady flow, forming the jet or column mode. At the highest flow rates, the liquid typically falls as a continuous film spanning the inter-tube space, in the sheet mode. The flow regime has important implications on heat transfer and the operation of falling-film heat exchangers. The intermittency of the droplet mode can raise concerns about surface de-wetting, but the large flow rates of the sheet mode are associated with a thicker film, both tend to decrease heat transfer. A discussion of these flows and a basis for interpreting mode transitions will be followed by an exploration of opportunities arising from new manufacturing methods and surface enhancement for solar desalination applications.
Friday, December 7, 2018 at 11:00am to 12:15pm
Composites Manufacturing Science Lab, Room 106
Composites Manufacturing Science Laboratory, University of Delaware, Newark, DE 19716, USA