Thermal two-phase analysis of nanomaterial in a pipe with turbulent flow
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ORIGINAL ARTICLE
Thermal two‑phase analysis of nanomaterial in a pipe with turbulent flow Yu‑Ming Chu1,2 · Elham Abohamzeh3 · Quang‑Vu Bach4 Received: 31 July 2020 / Accepted: 29 September 2020 © King Abdulaziz City for Science and Technology 2020
Abstract In this context, to scrutinize the treatment of nanofluid within a thermal unit equipped with turbulators, two-phase approach was implemented. Three cases were employed: helical tape (HT) (case I), Barrier helical tape (BHT) (Case II), Perforated BHT (Case III). The regime of fluid is turbulent which was modeled via K-ɛ method. The values of ΔP for case II are 1.36 and 1.4 times higher than case III at Re = 5000 and 20,000, respectively. With the enhance of Re, the maximum increment of Nu was reported for a third case in which 215.25% augmentation has been observed. Exergy loss has been scrutinized in current article to find the best design. Greater pumping power causes the radial flow to increase and more distortion occurs in isotherms which offer lower irreversibility and exergy drop. Second case has lowest exergy loss and can suggest obtaining the highest available work for the unit. At lowest Re, changing the configuration from case II to case I and III makes the exergy drop to augment about 20.46% and 8.87%. In addition, for the best case, augmenting Re leads to 81.35% reduction in exergy loss. The greatest impact of inlet velocity can be reached by considering case I. Keywords Nanomaterial · Mixture model · Perforated turbulator · Turbulent flow
Introduction There is a requirement to save energy due to industrialization and growing population worldwide. Increment of efficiency in a heating device, particularly heat exchangers can contribute to energy saving. Such devices employed to transfer/ recover thermal energy from a flowing medium to other. They are typically used to industrial and domestic goals such as food processing (Navickaitė et al. 2019), power generation
* Quang‑Vu Bach [email protected] 1
Department of Mathematics, Huzhou University, Huzhou 313000, People’s Republic of China
2
Hunan Provincial Key Laboratory of Mathematical Modeling and Analysis in Engineering, Changsha University of Science and Technology, Changsha 410114, People’s Republic of China
3
Department of Energy, Material and Energy Research Center (MERC), Karaj, Iran
4
Sustainable Management of Natural Resources and Environment Research Group, Faculty of Environment and Labour Safety, Ton Duc Thang University, Ho Chi Minh City, Vietnam
(Ge et al. 2017), air condition (Wright et al. 2018), pharmaceuticals and refrigeration (Zhang et al. 2018). In the last years, different technological developments have grown the demand for energy. Therefore, many endeavors were done to augment the performance of processes. As a considerable amount of heat transportation has been obtained by convection in the thermal systems, researchers were presented many techniques to develop convection mode. These techniques are separated into active and passive ones. In 2nd techniqu
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