Session: 05-03: Applied CFD

Paper Number: 131062

131062 - Comparison of Vortex Structures and Turbulent Heat Transport for a Single Jet and Multiple Jets in Crossflow 

The flow pattern of the hot air discharged from a single Air-Cooled Heat Exchanger (ACHE) fan and multiple ACHE fans under the crosswind condition is similar to a jet in cross flow (JICF) and multiple jets in crossflow (MJICF), respectively. The understanding of the physics in JICF and MJICF will help predict the Hot Air Recirculation (HAR) phenomena for achieving more production increases in LNG plants. This study aims to clarify the physics in JICF and MJICF, especially to reveal the role of upward wake vortex structure in thermal transport. The large eddy simulation (LES) of JICF and MJICF has been carried out. The jet-to-crossflow velocity ratio VR was 3.3 and the Reynolds number Re_c was 2100, based on crossflow velocity and jet nozzle diameter. The numerical schemes used in this study can reproduce the five typical vortex structures of JICF and provide a good prediction accuracy in mean velocity and RMS velocity fluctuation. The analysis reveals that the wake vortex in JICF plays an important role in the vertical turbulent heat transport. It has also shown that the wake vortexes in the MJICF can interact with each other and finally have an impact on heat transport, which is different from the JICF.

Presenting Author: Xidong Hu Tokyo Institute of Technology