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New flow boiling frictional pressure drop multipliers for smooth and microfin tubes

  • Ali Celen and Ahmet Selim Dalkılıç ORCID logo EMAIL logo
Published/Copyright: June 27, 2022
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Kerntechnik
From the journal Kerntechnik Volume 87 Issue 4

Abstract

The accurate calculation of pressure drop of evaporators/condensers are crucial and related with the pumping power, performance coefficient and energy consumption in a refrigeration equipment. This work aligns frictional pressure drop models/correlations with the experimental outcomes of boiling pressure drop of R134a in horizontal smooth and microfin copper tubes with equivalent outer diameter of 9.52 mm. The pressure drop through the test tube is obtained with a differential pressure transducer directly. Effective parameters are specified for smooth and microfin tubes and the most compatible models/correlations, 12 for smooth tubes and 9 for microfin ones, are determined accurately in relation to the consequences of investigation during intermittent and annular flow regime. Moreover, new two-phase multipliers have been developed by using regression analyses of 182 data points based on Lockhart-Martinelli parameter for each test tubes separately, and their predictability are found to be better than others in the literature as novel ones. Average errors of the developed empirical correlations are 11% for smooth and for 7% for microfin tubes. Finally, the measured data is given for the validation issues of researchers who can benefit from most of the investigated pressure drop models with tolerable accuracy regarding with their HEX design analyses.

Keywords: boiling; friction factor; microfin tube; pressure drop; two-phase flow
Corresponding author: Ahmet Selim Dalkılıç, Department of Mechanical Engineering, Heat and Thermodynamics Division, Faculty of Mechanical Engineering, Yildiz Technical University, Yildiz, Besiktas, Istanbul 34349, Turkey, E-mail:

Funding source: Yildiz Teknik Ãœniversitesi

Award Identifier / Grant number: 2013-06-01-KAP01

Acknowledgments

The authors also wish to thank Bilkar Soğutma Isıtma Klima ve Elektrik Malzemeleri San. Tic. Ltd. Şti. in Istanbul-Turkey (http://www.bilkarsogutma.com/) for valuable donation of the microfin tube used in the present study.

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: This study has been financially supported by Yildiz Technical University Scientific Research Projects Coordination Department, Project Number: 2013-06-01-KAP01.

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2022-02-08
Published Online: 2022-06-27
Published in Print: 2022-08-26

© 2022 Walter de Gruyter GmbH, Berlin/Boston

Articles in the same Issue

  1. Frontmatter
  2. Experimental investigation of thermal characteristics of a cylindrical heat pipe under varied system parameters and operating conditions
  3. Comparative analysis between homogeneous and heterogeneous models of gas cooled fast reactor core (GFR-2400)
  4. Updating risk model for SGTR accident based on success criteria analysis
  5. The analysis of fire ignition frequency calculation for small modular light water reactors
  6. New flow boiling frictional pressure drop multipliers for smooth and microfin tubes
  7. Steady state thermal hydraulic modelling of WWR-S tank-in-pool research reactor for the purpose of its power upgrading
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  9. The investigation of heat transfer enhancement by using different mixture conditions of graphene nanofluids on a downward facing surface
  10. Corrigendum to: Investigation of level density parameter dependence for some 233U, 235U, 237U, 239U, 249Cf, 251Cf, 237Pu and 247Cm nuclei in neutron fission cross sections with the incident energy up to 20 MeV
  11. Calendar of events
https://doi.org/10.1515/kern-2022-0012
Keywords for this article
boiling; friction factor; microfin tube; pressure drop; two-phase flow

Articles in the same Issue

  1. Frontmatter
  2. Experimental investigation of thermal characteristics of a cylindrical heat pipe under varied system parameters and operating conditions
  3. Comparative analysis between homogeneous and heterogeneous models of gas cooled fast reactor core (GFR-2400)
  4. Updating risk model for SGTR accident based on success criteria analysis
  5. The analysis of fire ignition frequency calculation for small modular light water reactors
  6. New flow boiling frictional pressure drop multipliers for smooth and microfin tubes
  7. Steady state thermal hydraulic modelling of WWR-S tank-in-pool research reactor for the purpose of its power upgrading
  8. Computational study of subcooled water injection into steam line: effect of Reynolds number on flow transition to study condensation induced water hammers
  9. The investigation of heat transfer enhancement by using different mixture conditions of graphene nanofluids on a downward facing surface
  10. Corrigendum to: Investigation of level density parameter dependence for some 233U, 235U, 237U, 239U, 249Cf, 251Cf, 237Pu and 247Cm nuclei in neutron fission cross sections with the incident energy up to 20 MeV
  11. Calendar of events
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