Hydrodynamic and Thermal Simultaneous Development in Pipes for All the Three Thermal Boundary Condition Types Using CFD
Yazarlar (3)
Dr. Öğr. Üyesi Eyüb Canlı Türkiye
Doç. Dr. Aziz Hakan Altun Türkiye
Prof. Dr. Ali ATEŞ Sinop Üniversitesi, Türkiye
| Bildiri Türü | Tebliğ/Bildiri | Bildiri Dili | İngilizce |
| Bildiri Alt Türü | Tam Metin Olarak Yayınlanan Tebliğ (Uluslararası Kongre/Sempozyum) | ||
| Bildiri Niteliği | Alanında Hakemli Uluslararası Kongre/Sempozyum | ||
| Kongre Adı | 4TH INTERNATIONAL CONFERENCE ON LIFE AND ENGINEERING SCIENCES, ICOLES 2021 | ||
| Kongre Tarihi | 23-09-2021 / 25-09-2021 | ||
| Basıldığı Ülke | Türkiye | Basıldığı Şehir | İstanbul |
| UAK Araştırma Alanları |
Hesaplamalı Akışkanlar Dinamiği
Isı Transferi
Hesaplamalı Yöntemler
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| Özet |
| In this work, three types of computational fluid dynamics thermal boundary conditions, ie, constant surface temperature (type I), constant heat flux (type II) and constant convection heat transfer coefficient (type III) were used for calculating heat transfer in pipes for flows ranging from laminar, through transition and towards turbulent. Zero wall thickness was assumed avoiding axial wall conduction heat transfer while fluid axial conduction was considered. According to the case design, spatial hydrodynamical and thermal development take place simultaneously. The developments are monitored by means of velocity and temperature changes. All the results are given nondimensional though a commercially available dimensional solver was used. The nondimensionalization procedure was based on a practical approach and it is explained. Prandtl number was kept constant at unity while Reynolds number was changed from 101 to 106, covering the flow range of laminar, transition and turbulent flow regimes. Thermophysical properties were assumed constant and hence, the flow field only changes with Reynolds number. However, temperature distribution is affected from the boundary condition types. Accordingly, it is concluded that thermal development should be evaluated by the change of local Nusselt number or flow bulk temperature. Empirical and analytical correlations were used for comparison between numerical and literature data. It is anticipated that changing Prandtl number, inducing wall thickness and temperature dependent variables would further change development lengths. Future work is prescribed. |
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