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The influence of the inclination angle on void fraction and heat transfer during condensation inside a smooth tube
Dissertation (MEng)--University of Pretoria, 2015.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2015
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| _version_ | 1867613630494670848 |
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| access_status_str | Open Access |
| author2 | Meyer, Josua P. |
| author_browse | Meyer, Josua P. |
| author_facet | Meyer, Josua P. |
| collection | Thesis |
| dc_rights_str_mv | © 2015 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MEng)--University of Pretoria, 2015. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/50752 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:39:12.360Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2015 |
| publishDateRange | 2015 |
| publishDateSort | 2015 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/50752 The influence of the inclination angle on void fraction and heat transfer during condensation inside a smooth tube Meyer, Josua P. u27102531@tuks.co.za Olivier, Stephanus Petrus UCTD Void fraction Two-phase flow Capacitance Flow pattern Condensation Inclination angle Heat transfer coefficient Engineering, built environment and information technology theses SDG-07 SDG-07: Affordable and clean energy Engineering, built environment and information technology theses SDG-09 SDG-09: Industry, innovation and infrastructure Dissertation (MEng)--University of Pretoria, 2015. The void fraction of condensation flow is an important parameter in determining the heat transfer and pressure drop characteristics of two-phase flow. In the past, studies involving void fraction, as well as heat transfer, have focused on horizontal and vertical flows. The current study measured void fractions during condensation and determined heat transfer coefficients for a full range of tube inclinations ranging from vertical downwards to vertical upwards at a condensation temperature of 40 ᵒC. The void fractions were measured using capacitive void fraction sensors. The measurements were taken on an 8.38 mm inner diameter smooth tube with 200 W of induced condensation heat transfer at mass fluxes ranging from 100 – 400 kg/m2.s and vapour qualities ranging from 10 – 90%. Alongside the void fractions, heat transfer measurements were also obtained for the full range of tube inclinations and compared with the void fraction measurements. The experimental data set generated consisted of 340 data points. At each data point, void fraction and heat transfer coefficients were measured. It was found that at combinations of low mass fluxes and vapour qualities, the void fraction and heat transfer coefficients were significantly affected by changes in inclination angle. Maximum values of heat transfer tended to coincide with downward inclinations where void fraction values decreased at low mass fluxes. Minimum heat transfer values tended to coincide with minimum void fraction measurements at upward inclinations for low mass fluxes. Predictions with established heat transfer, void fraction and flow pattern methods were also considered. For inclinations other than horizontal, the results were predicted less satisfactorily for low mass flux and vapour quality conditions. At high mass flux and vapour quality conditions, the void fraction and heat transfer coefficients tended to be independent of the inclination angle. At some intermediate mass flux and vapour quality conditions, the void fraction and heat transfer coefficients were observed to be independent of the inclination angle despite significant changes in the prevailing flow patterns. A sensitivity analysis revealed that the void fraction measurements needed to be very accurate to enable their use for heat transfer prediction purposes. tm2015 mi2025 Mechanical and Aeronautical Engineering MEng Unrestricted SDG-07: Affordable and clean energy SDG-09: Industry, innovation and infrastructure 2015-11-25T09:48:31Z 2015-11-25T09:48:31Z 2015/09/01 2015 Dissertation Olivier, SP 2015, The influence of the inclination angle on void fraction and heat transfer during condensation inside a smooth tube, MEng Dissertation, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/50752> S2015 http://hdl.handle.net/2263/50752 en © 2015 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | UCTD Void fraction Two-phase flow Capacitance Flow pattern Condensation Inclination angle Heat transfer coefficient Engineering, built environment and information technology theses SDG-07 SDG-07: Affordable and clean energy Engineering, built environment and information technology theses SDG-09 SDG-09: Industry, innovation and infrastructure The influence of the inclination angle on void fraction and heat transfer during condensation inside a smooth tube |
| title | The influence of the inclination angle on void fraction and heat transfer during condensation inside a smooth tube |
| title_full | The influence of the inclination angle on void fraction and heat transfer during condensation inside a smooth tube |
| title_fullStr | The influence of the inclination angle on void fraction and heat transfer during condensation inside a smooth tube |
| title_full_unstemmed | The influence of the inclination angle on void fraction and heat transfer during condensation inside a smooth tube |
| title_short | The influence of the inclination angle on void fraction and heat transfer during condensation inside a smooth tube |
| title_sort | influence of the inclination angle on void fraction and heat transfer during condensation inside a smooth tube |
| topic | UCTD Void fraction Two-phase flow Capacitance Flow pattern Condensation Inclination angle Heat transfer coefficient Engineering, built environment and information technology theses SDG-07 SDG-07: Affordable and clean energy Engineering, built environment and information technology theses SDG-09 SDG-09: Industry, innovation and infrastructure |
| url | http://hdl.handle.net/2263/50752 |