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Heat transfer and pressure drop characteristics of smooth tubes at a constant heat flux in the transitional flow regime
Dissertation (MEng)--University of Pretoria, 2011.
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| Format: | Thesis |
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University of Pretoria
2013
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| _version_ | 1867613612685656064 |
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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 | © 2011 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, 2011. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/28262 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:38:54.752Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2013 |
| publishDateRange | 2013 |
| publishDateSort | 2013 |
| 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:2263/28262 Heat transfer and pressure drop characteristics of smooth tubes at a constant heat flux in the transitional flow regime Meyer, Josua P. mhallquist@hatch.com.au Hallquist, Melissa Heat transfer coefficients Constant heat flux Transition Smooth tube UCTD Dissertation (MEng)--University of Pretoria, 2011. Due to constraints and changes in operating conditions, heat exchangers are often forced to operate under conditions of transitional flow. However, the heat transfer and flow behaviour in this regime is relatively unknown. By describing the transitional characteristics it would be possible to design heat exchangers to operate under these conditions and improve the efficiency of the system. The purpose of this study was to experimentally measure the heat transfer and pressure drop characteristics of smooth tubes at a constant heat flux in the transitional flow regime. The measurements were used to describe the flow behaviour of this regime and attempt to develop a correlation that can be used in the design of a heat exchanger. An experimental set-up was developed, consisting of an overall set-up, a removable test section as well as a controller, which ensured a uniform heat flux boundary. The test section allowed for the measurement of the temperature along the length of the test section, the pressure drop across the test section, the heat flux input and the flow rate. The measurements were used to determine the heat transfer coefficients and friction factor of the system. Three test sections were developed with outer diameters of 6, 8 and 10 mm in order to investigate the influence of heat exchanger size. Each test section was subject to four different heat flux cases of approximately 1 500, 3 000, 4 500 and 6 000 W/m2. The experiments covered a Reynolds number range of 450 to 10 300, a Prandtl number range of 4 to 7, a Nusselt number range of 2.3 to 67, and a Grashoff number range of 60 to 23 000. Good comparison was found between the measurements of this experiment and currently available literature. The experiments showed a smooth transition from laminar to turbulent flow with the onset of transition dependent on the heat flux of the system and with further data capturing, a correlation can be found to describe the Nusselt number in the transitional flow regime. Mechanical and Aeronautical Engineering unrestricted 2013-09-07T13:12:21Z 2012-10-01 2013-09-07T13:12:21Z 2012-09-06 2011 2012-09-28 Dissertation Hallquist, M 2011, Heat transfer and pressure drop characteristics of smooth tubes at a constant heat flux in the transitional flow regime, MEng dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/28262 > C12/9/7/ag http://hdl.handle.net/2263/28262 http://upetd.up.ac.za/thesis/available/etd-09282012-215000/ © 2011 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 | Heat transfer coefficients Constant heat flux Transition Smooth tube UCTD Heat transfer and pressure drop characteristics of smooth tubes at a constant heat flux in the transitional flow regime |
| title | Heat transfer and pressure drop characteristics of smooth tubes at a constant heat flux in the transitional flow regime |
| title_full | Heat transfer and pressure drop characteristics of smooth tubes at a constant heat flux in the transitional flow regime |
| title_fullStr | Heat transfer and pressure drop characteristics of smooth tubes at a constant heat flux in the transitional flow regime |
| title_full_unstemmed | Heat transfer and pressure drop characteristics of smooth tubes at a constant heat flux in the transitional flow regime |
| title_short | Heat transfer and pressure drop characteristics of smooth tubes at a constant heat flux in the transitional flow regime |
| title_sort | heat transfer and pressure drop characteristics of smooth tubes at a constant heat flux in the transitional flow regime |
| topic | Heat transfer coefficients Constant heat flux Transition Smooth tube UCTD |
| url | http://hdl.handle.net/2263/28262 http://upetd.up.ac.za/thesis/available/etd-09282012-215000/ |