Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
Experimental characterizing of outward annular impinging jets
Submission Author:
Luiz Fernando Bermero Nardi , RJ
Co-Authors:
Luiz Fernando Bermero Nardi
Presenter: Luiz Fernando Bermero Nardi
doi://10.26678/ABCM.ENCIT2018.CIT18-0682
Abstract
This study characterizes an impinging jet confined in the annular space between two concentric circular pipes. This geometry is commonly found in most gas injection wells. The experiments were carried out in a test bench, built with transparent pipes. Thus, optical measurement techniques could be adopted. Measurements were divided into velocimetry and heat transfer tests. For the velocity measurements, time resolved Particle Image Velocimetry techniques were employed. A planar configuration was chosen, hence only measurements in plane with the jet are presented. A set of 49 experiments with different configurations with respect to the number of jets within the annular space, the Reynolds number and the radial distance of the annular space are presented. Results show that confined impinging jet exhibits similarities with the case of an impinging jet of a flat surface. The flow fluctuations were analyzed in the frequency domain and most dominant structures were extracted from Proper Orthogonal Decomposition of the velocity flow field. For heat transfer experiments, a thermal camera was employed to acquire the temperature distribution around the pipe with a heated surface. The results were compared against correlations for Nusselt numbers available in the literature.
Keywords
Flow-induced Vibrations, Impinging jet, Annular flow, Particle image velocimetry, PIV, Proper Orthogonal Decomposition, POD, Convective Heat Transfer
