Optically-Based Volumetric Velocity and Temperature Measurements of Turbulent Junction Flows
Abstract
Experimental measurements of turbulent convective heat transport are challenging to acquire,due to the need to capture velocity and"" temperature simultaneously and the potential for probeinterference or thermal lag of the instrument. As a result, many modeling ef"forts rely on theassumption that turbulent heat transport is analogous to momentum transport (the Reynoldsanalogy). Few datasets e"xist to verify this assumption, especially for complex turbulent flows. Ofparticular interest here is the turbulent junction flow t"hat occurs at the base of an obstacle situatedin a turbulent boundary layer. The boundary layer irregularly rolls up into a coheren"t vortexstructure at the obstacle base, where the vortex can locally enhance endwall heat transfer by up to200% relative to the up"stream boundary layer. Prior work has demonstrated a link between theturbulent behavior of the junction fluid and the associated en"dwall surface heat transfer, but nowork has been done to understand the turbulent heat transport that ultimately drives the surface""convective heat transfer at the junction.Furthermore, many complex turbulent
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Sep 29, 2017
- Source ID
- N000141712881
Entities
People
- Stephen Lynch
Organizations
- Office of Naval Research
- Pennsylvania State University
- United States Navy