Compositive effect of nanoparticle parameter on thermal performance of cylindrical micro-grooved heat pipe using nanofluids

Performance enhancement of an experimental air conditioning system by using TiO2/methanol nanofluid in heat pipe heat exchangers

“…Results of the experiments confirmed higher thermal performance of heat pipes by a decrease in temperature gradient through them [27] or a reduction in thermal resistance [16,22,26,27,30]. In some experiments, higher heat transfer rates [34] and heat transfer coefficients [26,32] of heat pipes have been also observed. Despite extensive researches on heat pipes using nanofluids, practical application of this device in AC systems is hardly found.…”

“…A wide range of nanoparticles such as Ag [15][16][17][18][19][20], diamond [21], Au [22], Ti [23][24][25], Cu [26], Al 2 O 3 [27][28][29][30][31], CuO [26,28,[30][31][32], TiO 2 [30,31], SiO [26], Fe 2 O 3 /Fe 3 O 4 [33,34], CNT [35,36] have been used in various base fluids which were mostly water and alcohol. The effect of nanoparticles characteristics (such as type [26,30], particle size [16,22,26,27,30] and concentration in the base fluid [16,22,24,26,30,34]), as well as heat pipe design parameters [such as filling ratio (F.R.) [24], aspect ratio, inclination angle [24], wick structure, operating pressure [26], and length of various sections] and operational conditions (such as input power to the evaporator) on the thermal performance of heat pipes were investigated in these studies.…”

“…The effect of nanoparticles characteristics (such as type [26,30], particle size [16,22,26,27,30] and concentration in the base fluid [16,22,24,26,30,34]), as well as heat pipe design parameters [such as filling ratio (F.R.) [24], aspect ratio, inclination angle [24], wick structure, operating pressure [26], and length of various sections] and operational conditions (such as input power to the evaporator) on the thermal performance of heat pipes were investigated in these studies. Results of the experiments confirmed higher thermal performance of heat pipes by a decrease in temperature gradient through them [27] or a reduction in thermal resistance [16,22,26,27,30].…”

“…[24], aspect ratio, inclination angle [24], wick structure, operating pressure [26], and length of various sections] and operational conditions (such as input power to the evaporator) on the thermal performance of heat pipes were investigated in these studies. Results of the experiments confirmed higher thermal performance of heat pipes by a decrease in temperature gradient through them [27] or a reduction in thermal resistance [16,22,26,27,30]. In some experiments, higher heat transfer rates [34] and heat transfer coefficients [26,32] of heat pipes have been also observed.…”

Heat transfer enhancement of a loop thermosyphon with a hydrophobic spot-coated surface

“…Using particle-coated enhanced surface is a promising way to improve heat transfer by lowering the wall superheat and increasing HTC and CHF at sub-atmospheric pressures. Liu et al (2011) investigated the heat transfer performance of a heat pipe with nanoparticles experimentally, under pressures of 7.5 kPa, 12. 4 kPa, and 20.0 kPa.…”