Experimental investigation of the hydrothermal aspects of water–Fe3O4 nanofluid inside a twisted tube

Niknejadi, Mohammadreza; Afrand, Masoud; Karimipour, Arash; Shahsavar, Amin; Isfahani, Amir Homayoon Meghdadi

doi:10.1007/s10973-020-09271-0

Cited by 19 publications

(5 citation statements)

References 23 publications

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“…means that the maximum amount of the MF in the case under study is 450 G. Also, it should be noted that due to the fact that the findings related to the no MF case are presented in the previous work of authors [43], in the present study the focus is only on the findings related to the case of with MF.…”

Section: Findings and Discussionmentioning

confidence: 80%

“…To further validate the setup, the accuracy of the calculated values of the convection coefficient is examined. The local convection coefficient is calculated using the following equation [43]:…”

Section: Mathematical Modelingmentioning

confidence: 99%

“…where T s is the temperature of the tube surface and T m is the bulk temperature of fluid at the distance x from the entrance. The bulk temperature of fluid is also determined using the following equation [43]:…”

Section: Mathematical Modelingmentioning

confidence: 99%

“…Researchers working to improve the efficiency of heat transfer systems should always keep in mind that their proposed method for improving the system performance should not lead to a significant increase in the pressure drop. So far, various parameters have been proposed by researchers to assess the overall thermohydraulic features of heat transfer systems, one of the most famous and widely used of which is the thermal performance factor, which is calculated using the following equation [43]: where indices 1 and 2 correspond to systems 1 and 2. It should be noted that the parameter η indicates the thermohydraulic efficiency of system 1 compared to system 2 for the same pumping power.…”

Section: Mathematical Modelingmentioning

confidence: 99%

“…Niknejadi et al [43] conducted experiments to examine the thermohydraulic aspects of water-magnetite NF inside a TT. The impacts of Re, and twist pitch on the outcomes were explored.…”

Section: Introductionmentioning

confidence: 99%

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An experimental study on the cooling efficiency of magnetite–water nanofluid in a twisted tube exposed to a rotating magnetic field

Niknejadi

Afrand

Karimipour

et al. 2020

J Therm Anal Calorim

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In this experimental research, the laminar forced convection of water-magnetite nanofluid (NF) in a horizontal twisted tube (TT) is examined under a rotating magnetic field (MF). The findings are compared with those of the plain tube (PT). The influence of nanoadditive concentration ( ), Reynolds number (Re), twist pitch (P) and MF arrangement on the heat transfer, friction factor and overall thermohydraulic features of NF is assessed. The MF consists of two magnets that rotate around the tube. For each of the magnets, three modes of clockwise rotation, counterclockwise rotation and without rotation are considered. The findings showed that the combined use of TT and rotating MF entails an increase in the overall thermohydraulic features of water-magnetite NF. In addition, it was found that the overall thermohydraulic features of NF augment with boosting , while they decline with boosting P and Re. Moreover, it was revealed that the best thermohydraulic features of the water-magnetite NF belonged to the case of = 2%, Re = 500 and P = 10 mm in the presence of a rotating magnetic field resulting from the clockwise rotation of the first magnet and the counterclockwise rotation of the second magnet.

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Section: Findings and Discussionmentioning

confidence: 80%

Section: Mathematical Modelingmentioning

confidence: 99%

Section: Mathematical Modelingmentioning

confidence: 99%

Section: Mathematical Modelingmentioning

confidence: 99%

“…Niknejadi et al [43] conducted experiments to examine the thermohydraulic aspects of water-magnetite NF inside a TT. The impacts of Re, and twist pitch on the outcomes were explored.…”

Section: Introductionmentioning

confidence: 99%

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