Flow Pattern in a Vertical Channel with Heated Surface
Authors
Safar, Manezha ; Kipourou, Angeliki
Term
4. term
Publication year
2015
Submitted on
2015-06-10
Pages
70
Abstract
This thesis investigates the free convective flow pattern in a vertical channel with an asymmetrically heated surface using both experimental and analytical/numerical approaches. A full-scale test facility was built at Aalborg University, and velocity and temperature profiles were measured in the channel for Rayleigh numbers from 3.3 x 10^12 to 12 x 10^12 and an aspect ratio (H/b) of 8. A key objective is to characterize the flow regime in the cavity and identify the conditions under which the flow transitions from laminar to turbulent, a phase where recirculation can occur and convective heat transfer increases. The experimental data are used to validate a CFD-based numerical solution employing the realizable k-epsilon turbulence model, and comparisons of measured and simulated velocity and temperature profiles along the channel are presented. Specific quantitative findings on transition criteria are not provided in this excerpt.
Denne afhandling undersøger det frie konvektive strømningsmønster i en lodret kanal med asymmetrisk opvarmet overflade gennem både eksperimenter og analytiske/numeriske metoder. En fuldskala forsøgsopstilling på Aalborg Universitet blev etableret, hvor hastigheds- og temperaturprofiler i kanalen blev målt for et Rayleigh-tal i området 3.3 x 10^12 til 12 x 10^12 og en aspektforhold (H/b) på 8. Et hovedformål er at karakterisere strømningsregimet i hulrummet og identificere betingelserne for overgang fra laminart til turbulent flow, hvor recirkulation kan optræde og øget konvektiv varmeoverførsel forekommer. De eksperimentelle data anvendes til at validere en numerisk løsning baseret på CFD med en realizable k-epsilon turbulensmodel, og sammenligninger af målte og simulerede hastigheds- og temperaturprofiler langs kanalen præsenteres. Konkrete kvantitative resultater for overgangskriterier er ikke angivet i dette uddrag.
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