Synthesis and Characterization of Nanofluids …
41
nanofluids are discussed in this chapter along with few properties. The main properties of nanofluids are their thermal, electrical and optical properties which are very
important as far as the various applications of nanofluids are concerned. Accordingly,
there are some factors that affect these properties. There is certain mechanism which
is responsible for the extraordinary behaviour of nanofluids.
Enhanced thermal properties of the nanofluids are an outcome of the high surface area provided by the nanoparticles in the nanofluid, their Brownian motion in
the nanofluid and the interfacial layer of the basefluid that surrounds the nanoparticles and possesses higher thermal conductivity than the rest of the fluid in bulk.
These are helpful in various heat transfer enhancement processes as studied by various researchers. Also, the formation of EDL on the surface of the nanoparticles
is responsible for electrical conductivity of the nanofluids. There are model relationships that are useful in predicting the thermal conductivity as well as electrical
conductivity of the nanofluids, as found out by various researchers. The role of zeta
potential in the electrical properties of the nanofluids is also a factor to be considered.
Researchers have used several methods to measure the thermal and electrical conductivities of the nanofluids, amongst which few have become very famous. There
are several applications based on the thermal properties of the nanofluids but very
few are based on the electrical properties of the nanofluids. Particle size distribution
is yet another property that has importance as far as thermal and optical properties
of the nanofluids are concerned. There are several factors that affect the particle
size distribution. Agglomeration is one basic property that must be considered while
determining the polydispersity of the nanofluids.
References
Abdolbaqi MKh, Azmi WH, Mamat R, Sharma KV, Najafi G (2016) Experimental investigation
of thermal conductivity and electrical conductivity of bioglycol-water mixture based Al 2 O 3
nanofluid. Appl Therm Eng 102:932–941
Adio SA, Sharifpur M, Meyer JP (2015a) Factors affecting the pH and electrical conductivity of
MgO-ethylene glycol nanofluids. Bull Mater Sci 38:1345–1357
Adio SA, Sharifpur M, Meyer JP (2015b) Investigation into effective viscosity, electrical conductivity, and pH of γ-Al 2 O 3 -glycerol nanofluids in Einstein concentration regime. Heat Trans Eng
38:1241–1251
Aghayari R, Maddah H, Ahmadi MH, Yan W, Ghasemi N (2018) Measurement and artificial neural
network modeling of electrical conductivity of CuO/glycerol nanofluids at various thermal and
concentration conditions. Energies 11:1190
Ahammed N, Asirvatham LG, Titus J, Bose JR, Wongwises S (2016) Measurement of thermal
conductivity of graphene–water nanofluid at below and above ambient temperatures. Int Commun
Heat Mass 70:66–74
Akoh H, Tsukasaki Y, Yatsuya S, Tasaki A (1978) Magnetic properties of ferromagnetic ultrafine
particles prepared by vacuum evaporation on running oil substrate. J Crystal Growth 45:495–500
Alawi OA, Sidik NAC, Xian HW, Kean TH, Kazi SN (2018) Thermal conductivity and viscosity
models of metallic oxides nanofluids. Int J Heat Mass Transf 116:1314–1325
41
nanofluids are discussed in this chapter along with few properties. The main properties of nanofluids are their thermal, electrical and optical properties which are very
important as far as the various applications of nanofluids are concerned. Accordingly,
there are some factors that affect these properties. There is certain mechanism which
is responsible for the extraordinary behaviour of nanofluids.
Enhanced thermal properties of the nanofluids are an outcome of the high surface area provided by the nanoparticles in the nanofluid, their Brownian motion in
the nanofluid and the interfacial layer of the basefluid that surrounds the nanoparticles and possesses higher thermal conductivity than the rest of the fluid in bulk.
These are helpful in various heat transfer enhancement processes as studied by various researchers. Also, the formation of EDL on the surface of the nanoparticles
is responsible for electrical conductivity of the nanofluids. There are model relationships that are useful in predicting the thermal conductivity as well as electrical
conductivity of the nanofluids, as found out by various researchers. The role of zeta
potential in the electrical properties of the nanofluids is also a factor to be considered.
Researchers have used several methods to measure the thermal and electrical conductivities of the nanofluids, amongst which few have become very famous. There
are several applications based on the thermal properties of the nanofluids but very
few are based on the electrical properties of the nanofluids. Particle size distribution
is yet another property that has importance as far as thermal and optical properties
of the nanofluids are concerned. There are several factors that affect the particle
size distribution. Agglomeration is one basic property that must be considered while
determining the polydispersity of the nanofluids.
References
Abdolbaqi MKh, Azmi WH, Mamat R, Sharma KV, Najafi G (2016) Experimental investigation
of thermal conductivity and electrical conductivity of bioglycol-water mixture based Al 2 O 3
nanofluid. Appl Therm Eng 102:932–941
Adio SA, Sharifpur M, Meyer JP (2015a) Factors affecting the pH and electrical conductivity of
MgO-ethylene glycol nanofluids. Bull Mater Sci 38:1345–1357
Adio SA, Sharifpur M, Meyer JP (2015b) Investigation into effective viscosity, electrical conductivity, and pH of γ-Al 2 O 3 -glycerol nanofluids in Einstein concentration regime. Heat Trans Eng
38:1241–1251
Aghayari R, Maddah H, Ahmadi MH, Yan W, Ghasemi N (2018) Measurement and artificial neural
network modeling of electrical conductivity of CuO/glycerol nanofluids at various thermal and
concentration conditions. Energies 11:1190
Ahammed N, Asirvatham LG, Titus J, Bose JR, Wongwises S (2016) Measurement of thermal
conductivity of graphene–water nanofluid at below and above ambient temperatures. Int Commun
Heat Mass 70:66–74
Akoh H, Tsukasaki Y, Yatsuya S, Tasaki A (1978) Magnetic properties of ferromagnetic ultrafine
particles prepared by vacuum evaporation on running oil substrate. J Crystal Growth 45:495–500
Alawi OA, Sidik NAC, Xian HW, Kean TH, Kazi SN (2018) Thermal conductivity and viscosity
models of metallic oxides nanofluids. Int J Heat Mass Transf 116:1314–1325