Nanomaterial thermal performance within a pipe in presence of turbulator
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ORIGINAL ARTICLE
Nanomaterial thermal performance within a pipe in presence of turbulator M. Sheikholeslami1,2 · M. Jafaryar2 · Mikhail A. Sheremet3 · Ahmad Shafee4 · Houman Babazadeh5,6 Received: 19 February 2020 / Accepted: 25 April 2020 © King Abdulaziz City for Science and Technology 2020
Abstract In this context, multi tapes were utilized to enhance the productivity of the thermal unit which is filled with hybrid nano powder. Turbulent flow was analyzed by means of k-ɛ approach and FVM was utilized to tackle the governing equations and two formulas were offered for Nu and friction factor in outputs. Insert of swirl flow device makes the nanomaterial contact more to wall and pressure drop augments as well as Nusselt number. Pressure drop of N = 1 and 2.5 are found to increase about 34.49% and 32.47% with rise of Re. More resistance of nanomaterial due to higher revolution makes f to increase. As power of pump rises, the bulk velocity augments and it reduces the friction factor. When N augments from 1 to 2.5, the impact of Re on f reduces about 2.02%. As revolution enhances, faster movement of nanomaterial provides higher temperature gradient. At N = 2.5, Nu grows about 178.32% with rise of Re. Nu is experienced augmentation about 22.15% with rise of N when Re* = 5. Disruption of boundary layer with augment of N makes it thinner which results in greater Nu. Rise of Re can decline the impact of N on Nu while its influence on pressure drop augments. Keywords Multi helical tape · Hybrid nanoparticle · Convection · Pressure loss
Introduction Typical liquids such as oil and water have restricted thermal feature because of their small rate of thermal conductivity. However, metals have thermal conductivity * Houman Babazadeh [email protected] M. Sheikholeslami [email protected] 1
Department of Mechanical Engineering, Babol Noshirvani University of Technology, Babol, Islamic Republic of Iran
2
Renewable Energy Systems and Nanofluid Applications in Heat Transfer Laboratory, Babol Noshirvani University of Technology, Babol, Iran
3
Laboratory on Convective Heat and Mass Transfer, Tomsk State University, Tomsk 634050, Russia
4
Institute of Research and Development, Duy Tan University, Da Nang 550000, Vietnam
5
Department for Management of Science and Technology Development, Ton Duc Thang University, Ho Chi Minh City, Vietnam
6
Faculty of Environment and Labour Safety, Ton Duc Thang University, Ho Chi Minh City, Vietnam
three times greater compared with such liquids. Hence, it is favorable to mix metals with those fluids in order to achieve higher rate of thermal conductivity. Nanoparticles can suspend much longer compared with larger sizes of particles. This helps the liquid to pursue behaviors similar to a stable colloidal suspension rather than a settling suspension. Adding nanoparticles to fluids leads the efficient heat transfer. The first researcher who defined the term of ‘nanofluid’ were Choi et al. () who illustrated that adding small size of nanoparticles (lower
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