Modelling and Analysis of Viscoelastic and Nanofluid Effects on the Heat Transfer Characteristics in a Double-Pipe Counter-Flow Heat Exchanger

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dc.contributor.authorMavi, Anele
dc.contributor.authorChinyoka, Tiri
dc.contributor.authorGill, Andrew
dc.date.accessioned2022-08-31T20:40:01Z
dc.date.available2022-08-31T20:40:01Z
dc.date.issued2022-05-28
dc.date.updated2022-06-09T13:40:43Z
dc.description.abstractThis study computationally investigates the heat transfer characteristics in a double-pipe counter-flow heat-exchanger. A heated viscoelastic fluid occupies the inner core region, and the outer annulus is filled with a colder Newtonian-Fluid-Based Nanofluid (NFBN). A mathematical model is developed to study the conjugate heat transfer characteristics and heat exchange properties from the hot viscoelastic fluid to the colder NFBN. The mathematical modelling and formulation of the given problem comprises of a system of coupled nonlinear partial differential Equations (PDEs) governing the flow, heat transfer, and stress characteristics. The viscoelastic stress behaviour of the core fluid is modelled via the Giesekus constitutive equations. The mathematical complexity arising from the coupled system of transient and nonlinear PDEs makes them analytically intractable, and hence, a recourse to numerical and computational methodologies is unavoidable. A numerical methodology based on the finite volume methods (FVM) is employed. The FVM algorithms are computationally implemented on the OpenFOAM software platform. The dependence of the field variables, namely the velocity, temperature, pressure, and polymeric stresses on the embedded flow parameters, are explored in detail. In particular, the results illustrate that an increase in the nanoparticle volume-fraction, in the NFBN, leads to enhanced heat-exchange characteristics from the hot core fluid to the colder shell NFBN. Specifically, the results illustrate that the use of NFBN as the coolant fluid leads to enhanced cooling of the hot core-fluid as compared to using an ordinary (nanoparticle free) Newtonian coolant.en_US
dc.identifierdoi: 10.3390/app12115475
dc.identifier.apacitationMavi, A., Chinyoka, T., & Gill, A. (2022). Modelling and Analysis of Viscoelastic and Nanofluid Effects on the Heat Transfer Characteristics in a Double-Pipe Counter-Flow Heat Exchanger. <i>Applied Sciences</i>, 12(11), 5475. http://hdl.handle.net/11427/36791en_ZA
dc.identifier.chicagocitationMavi, Anele, Tiri Chinyoka, and Andrew Gill "Modelling and Analysis of Viscoelastic and Nanofluid Effects on the Heat Transfer Characteristics in a Double-Pipe Counter-Flow Heat Exchanger." <i>Applied Sciences</i> 12, 11. (2022): 5475. http://hdl.handle.net/11427/36791en_ZA
dc.identifier.citationMavi, A., Chinyoka, T. & Gill, A. 2022. Modelling and Analysis of Viscoelastic and Nanofluid Effects on the Heat Transfer Characteristics in a Double-Pipe Counter-Flow Heat Exchanger. <i>Applied Sciences.</i> 12(11):5475. http://hdl.handle.net/11427/36791en_ZA
dc.identifier.ris TY - Journal Article AU - Mavi, Anele AU - Chinyoka, Tiri AU - Gill, Andrew AB - This study computationally investigates the heat transfer characteristics in a double-pipe counter-flow heat-exchanger. A heated viscoelastic fluid occupies the inner core region, and the outer annulus is filled with a colder Newtonian-Fluid-Based Nanofluid (NFBN). A mathematical model is developed to study the conjugate heat transfer characteristics and heat exchange properties from the hot viscoelastic fluid to the colder NFBN. The mathematical modelling and formulation of the given problem comprises of a system of coupled nonlinear partial differential Equations (PDEs) governing the flow, heat transfer, and stress characteristics. The viscoelastic stress behaviour of the core fluid is modelled via the Giesekus constitutive equations. The mathematical complexity arising from the coupled system of transient and nonlinear PDEs makes them analytically intractable, and hence, a recourse to numerical and computational methodologies is unavoidable. A numerical methodology based on the finite volume methods (FVM) is employed. The FVM algorithms are computationally implemented on the OpenFOAM software platform. The dependence of the field variables, namely the velocity, temperature, pressure, and polymeric stresses on the embedded flow parameters, are explored in detail. In particular, the results illustrate that an increase in the nanoparticle volume-fraction, in the NFBN, leads to enhanced heat-exchange characteristics from the hot core fluid to the colder shell NFBN. Specifically, the results illustrate that the use of NFBN as the coolant fluid leads to enhanced cooling of the hot core-fluid as compared to using an ordinary (nanoparticle free) Newtonian coolant. DA - 2022-05-28 DB - OpenUCT DP - University of Cape Town IS - 11 J1 - Applied Sciences LK - https://open.uct.ac.za PY - 2022 T1 - Modelling and Analysis of Viscoelastic and Nanofluid Effects on the Heat Transfer Characteristics in a Double-Pipe Counter-Flow Heat Exchanger TI - Modelling and Analysis of Viscoelastic and Nanofluid Effects on the Heat Transfer Characteristics in a Double-Pipe Counter-Flow Heat Exchanger UR - http://hdl.handle.net/11427/36791 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/36791
dc.identifier.vancouvercitationMavi A, Chinyoka T, Gill A. Modelling and Analysis of Viscoelastic and Nanofluid Effects on the Heat Transfer Characteristics in a Double-Pipe Counter-Flow Heat Exchanger. Applied Sciences. 2022;12(11):5475. http://hdl.handle.net/11427/36791.en_ZA
dc.language.isoenen_US
dc.publisher.departmentDepartment of Mathematics and Applied Mathematicsen_US
dc.publisher.facultyFaculty of Scienceen_US
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en_US
dc.sourceApplied Sciencesen_US
dc.source.journalissue11en_US
dc.source.journalvolume12en_US
dc.source.pagination5475en_US
dc.source.urihttps://www.mdpi.com/journal/applsci
dc.titleModelling and Analysis of Viscoelastic and Nanofluid Effects on the Heat Transfer Characteristics in a Double-Pipe Counter-Flow Heat Exchangeren_US
dc.typeJournal Articleen_US
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