NDLI: Oil Effects on In-Tube Evaporation of CO2 by Altering Flow Regime and Properties

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Oil Effects on In-Tube Evaporation of CO2 by Altering Flow Regime and Properties

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Hrnjak, Pega Kim, Seongho
Copyright Year	2013
Abstract	Flow boiling heat transfer characteristics of CO2 with and without oil were investigated experimentally in horizontal smooth and enhanced tubes with an inner diameter of 11.2 mm. The visualization of flow pattern provides a detailed attributes of the nucleate and the convective boiling heat transfer. In order to investigate the effect of the miscible oil on the heat transfer of CO2, POE (polyolester) RENSIO C85E oil is added to give an oil circulation rate (OCR) between 0.5% and 2%. Results are compared with those of pure CO2. The experimental conditions include evaporation temperatures of −15 °C, mass fluxes from 40 to 200 kg/m2 s, heat fluxes from 0.5 to 10 kW/m2, and vapor qualities from 0.1 to 0.8. Oil generally deteriorates the heat transfer coefficient of pure CO2. The reduction in heat transfer coefficient is most apparent at low vapor qualities, 0.1 to 0.4, and at low mass fluxes, 100 and 200 kg/m2. It is caused by the suppression of nucleate boiling due to increased surface tension. At conditions where the convective boiling contribution is dominant, vapor qualities above 0.5, oil increases heat transfer coefficients. Through visualization, it is shown that the wetted area on the perimeter of inner tube is enhanced due to formation of foaming in the smooth tube. However, such enhancement of heat transfer due to forming is negligible in the enhanced tube, because the enhanced factor due to micro-finned structures is dominant.
Sponsorship	Heat Transfer Division
File Format	PDF
ISBN	9780791855485
DOI	10.1115/HT2013-17838
Volume Number	Volume 2: Heat Transfer Enhancement for Practical Applications; Heat and Mass Transfer in Fire and Combustion; Heat Transfer in Multiphase Systems; Heat and Mass Transfer in Biotechnology
Conference Proceedings	ASME 2013 Heat Transfer Summer Conference collocated with the ASME 2013 7th International Conference on Energy Sustainability and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology
Language	English
Publisher Date	2013-07-14
Publisher Place	Minneapolis, Minnesota, USA
Access Restriction	Subscribed
Subject Keyword	Visualization Temperature Carbon dioxide Vapors Evaporation Flow (dynamics) Boiling Heat Flux (metallurgy) Nucleate boiling Surface tension Heat transfer coefficients Heat transfer
Content Type	Text
Resource Type	Article

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