Effect of longitudinal micro fin tube enhancement in evaporation of R410A
Vivanco Obeso, Sergio Daniel
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https://hdl.handle.net/2142/89069
Description
Title
Effect of longitudinal micro fin tube enhancement in evaporation of R410A
Author(s)
Vivanco Obeso, Sergio Daniel
Issue Date
2015-12-09
Director of Research (if dissertation) or Advisor (if thesis)
Hrnjak, Predrag S.
Department of Study
Mechanical Science & Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
heat transfer coefficient
micro fin tube enhancement
Abstract
An experimental investigation of evaporating heat transfer was conducted for smooth and
coaxial micro-finned aluminum tubes with an internal diameter of 6.3 mm. The study used
R410A at a saturation temperature of 10 °C running at mass fluxes from 100 to 250 kg/m2-s, heat
fluxes from 4 to 14 kW/m2, and qualities from 0.1 to 0.8.
The testing facility had a 15 cm long test section heated by a secondary heated water loop, a
transparent visualization section which used a high-speed camera to capture flow regimes, and
vertical and horizontal pressure drop test sections. The micro-finned enhancement factors were
1.14-1.85, 0.91-1.72, and 1.05-1.66 for heat fluxes of 4, 9 and 14 kW/m2 correspondingly.
Calculations for the finned tube used the molten diameter surface. Flow regimes were similar for
both tubes, except for qualities tested, and the regimes were correctly predicted by Cheng et al.
(2008). Images of the flow regimes were captured for each testing quality and for mass fluxes.
Pressure drop in the micro-finned tube was higher than the smooth tube for both horizontal and
vertical tube orientations. The difference in pressure drop increased with higher vapor quality.
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