TY - JOUR
T1 - Forced convection of a temperature-sensitive ferrofluid in presence of magnetic field of electrical current-carrying wire
T2 - A two-phase approach
AU - Hangi, Morteza
AU - Bahiraei, Mehdi
AU - Rahbari, Alireza
N1 - Publisher Copyright:
© 2018 The Society of Powder Technology Japan
PY - 2018/9
Y1 - 2018/9
N2 - This research examines laminar forced convection of a temperature-sensitive magnetic nanofluid flowing within a horizontal tube through the two-phase mixture model. The ferrofluid flowing in the tube is exposed to the magnetic field generated by electrical current-carrying wire(s) along the tube, and the effect of such magnetic field is studied on heat and mass transfer phenomena. It is observed that due to the dependency of magnetization on temperature, the cold fluid flowing at the central regions of the tube is attracted more significantly towards the source of the magnetic field, which results in creation of secondary flow. Such mixing in the flow, subsequently, disturbs the thermal and hydrodynamic boundary layers, especially at the vicinity of the magnetic field source, leading to better heat transfer rate and also higher pressure drop. Furthermore, increasing the strength of the magnetic field leads to greater enhancement in heat transfer, while increasing the Reynolds number decreases the effectiveness of the magnetic field on the ferrofluid flow and heat transfer. Moreover, placing two wires above and under the tube can enhance the heat transfer even more significantly, such that the average convective heat transfer coefficient in this case is about 34.5% higher than that of the case without magnetic field.
AB - This research examines laminar forced convection of a temperature-sensitive magnetic nanofluid flowing within a horizontal tube through the two-phase mixture model. The ferrofluid flowing in the tube is exposed to the magnetic field generated by electrical current-carrying wire(s) along the tube, and the effect of such magnetic field is studied on heat and mass transfer phenomena. It is observed that due to the dependency of magnetization on temperature, the cold fluid flowing at the central regions of the tube is attracted more significantly towards the source of the magnetic field, which results in creation of secondary flow. Such mixing in the flow, subsequently, disturbs the thermal and hydrodynamic boundary layers, especially at the vicinity of the magnetic field source, leading to better heat transfer rate and also higher pressure drop. Furthermore, increasing the strength of the magnetic field leads to greater enhancement in heat transfer, while increasing the Reynolds number decreases the effectiveness of the magnetic field on the ferrofluid flow and heat transfer. Moreover, placing two wires above and under the tube can enhance the heat transfer even more significantly, such that the average convective heat transfer coefficient in this case is about 34.5% higher than that of the case without magnetic field.
KW - Forced convection
KW - Heat transfer enhancement
KW - Magnetic field
KW - Temperature-sensitive ferrofluid
KW - Two-phase mixture model
UR - http://www.scopus.com/inward/record.url?scp=85048269264&partnerID=8YFLogxK
U2 - 10.1016/j.apt.2018.05.026
DO - 10.1016/j.apt.2018.05.026
M3 - Article
SN - 0921-8831
VL - 29
SP - 2168
EP - 2175
JO - Advanced Powder Technology
JF - Advanced Powder Technology
IS - 9
ER -