Thermal performance of a new nanofluid containing biologically functionalized graphene nanoplatelets inside tubes equipped with rotating coaxial double-twisted tapes
作者： Mehdi Bahiraei , Nima Mazaheri , Mehran Sheykh Mohammadi , Hossein Moayedi
DOI: 10.1016/J.ICHEATMASSTRANSFER.2019.104305
关键词: Materials science 、 Heat transfer 、 Heat transfer coefficient 、 Rotational speed 、 Coaxial 、 Heat transfer enhancement 、 Figure of merit 、 Pressure drop 、 Nanofluid 、 Composite material 、 Atomic and Molecular Physics, and Optics 、 General Chemical Engineering 、 Condensed matter physics
摘要: Abstract This research attempts to investigate the benefits of utilizing two heat transfer enhancement methods simultaneously. These techniques include employing biological graphene-based nanofluid and using rotating coaxial double-twisted tapes (RCDTT) enhance inside tubes. Using is desirable such that at twisted ratio 2.5 rotational speed 0 rpm, coefficient improves about 16.3% by increase concentration from 0 0.1%. Furthermore, higher suggested its 900 rpm, 3.5 0%, causes a 77% increment in coefficient. Lower ratios are also more effective for enhancing rate. The has great impact on pressure drop, 34% drop occurs with increasing 300 rpm 900 rpm weight fraction 0.075% 3.5. Owing intense disturbances generated greater speeds, particle residence time becomes leading pumping power increment. figure merit all cases than 1, which an excellent outcome energy efficiency viewpoint.
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