Zia Miry | University of Tehran (original) (raw)

Papers by Zia Miry

Research paper thumbnail of Heat transfer and hydrodynamic performance analysis of a miniature tangential heat sink using Al2O3-H2O and TiO2- H2O nanofluids

In this paper thermal and hydrodynamic performances of a miniature tangential heat sink are inves... more In this paper thermal and hydrodynamic performances of a miniature tangential heat sink are investigated experimentally by using Al2O3-H2O and Tio2-H2O nanofluids. The effects of flow rate and volume concentration on the thermal performance have been investigated for the Reynolds number range of 210 to 1100. Experimental results show that the average convective heat transfer coefficient increases 14 % and 11% and the bottom temperature of the heat sink decreases 2.2˚C and 1.6˚C by using Al2O3-H2O and Tio2-H2O nanofluid instead of pure distilled water, respectively.

Research paper thumbnail of Hydrodynamic and Heat transfer Characteristics of a miniature plate pin-fin heat sink utilizing Al2O3-water and TiO2-water nanofluids

Journal of Thermal Science and Engineering Applications, 2015

In this paper thermal and hydrodynamic performances of a miniature tangential heat sink are inves... more In this paper thermal and hydrodynamic performances of a miniature tangential heat sink are investigated experimentally by using Al 2 O 3 -H 2 O and Tio 2 -H 2 O nanofluids. The effects of flow rate and volume concentration on the thermal performance have been investigated for the Reynolds number range of 210 to 1100. Experimental results show that the average convective heat transfer coefficient increases 14 % and 11% and the bottom temperature of the heat sink decreases 2.2˚C and 1.6˚C by using Al 2 O 3 -H 2 O and Tio2-H 2 O nanofluid instead of pure distilled water, respectively.

Research paper thumbnail of Hydrodynamics and heat transfer characteristics of a novel heat exchanger with delta-winglet vortex generators

Chemical Engineering Science, 2010

CITATIONS 0 READS 163 4 authors, including: Some of the authors of this publication are also work... more CITATIONS 0 READS 163 4 authors, including: Some of the authors of this publication are also working on these related projects: combustion, battery pack cooling with PCM and metal foam, miniature heat sink with ferrofluid under alternate magnetic field View project Abstract In this paper thermal and hydrodynamic performances of a miniature tangential heat sink are investigated experimentally by using Al 2 O 3 -H 2 O and Tio 2 -H 2 O nanofluids. The effects of flow rate and volume concentration on the thermal performance have been investigated for the Reynolds number range of 210 to 1100. Experimental results show that the average convective heat transfer coefficient increases 14 % and 11% and the bottom temperature of the heat sink decreases 2.2˚C and 1.6˚C by using Al 2 O 3 -H 2 O and Tio2-H 2 O nanofluid instead of pure distilled water, respectively.

Research paper thumbnail of A numerical investigation on thermal performance of a plate pin fin heat sink using Al2O3 –H2O nanofluid

In this research, thermal and hydrodynamic performance of nanofluids impinging jet on plate pin-f... more In this research, thermal and hydrodynamic performance of nanofluids impinging jet on plate pin-fin heat sink (PPFHS) was studied using commercial software FLUENT. Nanoparticles and the base fluid are considered Al2O3 and water, respectively. Performance of the PPFHS was studied for nanofluids in four different volume concentrations (0.5, 1, 1.5 and 2%) compared to base fluid (water). The PPFHS is composed of five rectangular channels which within each there is a three-pin circular cross-section with a direct arrangement. Nanofluids impinging jet flow regime in the PPFHS is laminar. Also a constant heat flux is applied to the bottom surface of PPFHS. Based on the results of numerical simulations, it has been seen that with increasing Reynolds number and the volume fraction of nanoparticles in the base fluid, the average convective heat transfer coefficient increased by up to 16.49% at 2% volume concentration. Also, thermal resistance decreases by increasing nanofluids volume concentration and Reynolds number. Also, the pumping power increases with increasing volume fraction of aluminum oxide nanoparticles in water-base fluid. Although the numerical results indicate increasing the pumping power up to 48.15%, for alumina nanofluids with volume concentrations of 2% compared to base fluid (water), but there is an increase in the average heat transfer coefficient of PPFHS up to 16.49% and reduce in the thermal resistance of the PPFHS up to 20.4% for alumina nanofluids with volume concentrations of 2% compared to base fluid, so this finds show usability of nanofluids in improving the heat transfer performance of the PPFHS and cooling it.

Research paper thumbnail of Hydrodynamics and Heat Transfer Characteristics of a Miniature Plate Pin-Fin Heat Sink Utilizing Al2O3-Water and TiO2-Water Nanofluids

In this paper, the hydrodynamic and thermal performance of a miniature plate pin finned heat sink... more In this paper, the hydrodynamic and thermal performance of a miniature plate pin finned heat sink is investigated experimentally by utilizing two widely used nanofluids, Al2O3-water and TiO2-water. The heat sink base plate which is used in the cooling process of electronic devices, has the dimensions of 42 mm (L)×42 mm (W)×14 mm (H) and is made of Aluminum and placed in a plexiglass case which is isolated from the environment using an insulator foam. The thermal performance of the heat sink is investigated by passing the nanofluid at constant inlet temperature while applying a constant heat flux of 124.8 kW/m2 to the bottom surface of the heat sink. The nanofluids are prepared in volume concentrations of 0.5, 1, 1.5, and 2 percent and their performances are measured considering water as the base fluid. Measuring the pressure difference between the entrance and exit of the heat sink made it possible to study the hydrodynamic performance of the heat sink. Although the measurements showed 15% and 30% increase in the pumping power for the volume concentration of 2 % of Al2O3-water and TiO2-water nanofluids, respectively, the average heat transfer coefficients increased by 16% and 14% and the thermal resistance decreased by 17% and 14% for each nanofluid.

Research paper thumbnail of Heat transfer and hydrodynamic performance analysis of a miniature tangential heat sink using Al2O3-H2O and TiO2- H2O nanofluids

In this paper thermal and hydrodynamic performances of a miniature tangential heat sink are inves... more In this paper thermal and hydrodynamic performances of a miniature tangential heat sink are investigated experimentally by using Al2O3-H2O and Tio2-H2O nanofluids. The effects of flow rate and volume concentration on the thermal performance have been investigated for the Reynolds number range of 210 to 1100. Experimental results show that the average convective heat transfer coefficient increases 14 % and 11% and the bottom temperature of the heat sink decreases 2.2˚C and 1.6˚C by using Al2O3-H2O and Tio2-H2O nanofluid instead of pure distilled water, respectively.

Research paper thumbnail of Hydrodynamic and Heat transfer Characteristics of a miniature plate pin-fin heat sink utilizing Al2O3-water and TiO2-water nanofluids

Journal of Thermal Science and Engineering Applications, 2015

In this paper thermal and hydrodynamic performances of a miniature tangential heat sink are inves... more In this paper thermal and hydrodynamic performances of a miniature tangential heat sink are investigated experimentally by using Al 2 O 3 -H 2 O and Tio 2 -H 2 O nanofluids. The effects of flow rate and volume concentration on the thermal performance have been investigated for the Reynolds number range of 210 to 1100. Experimental results show that the average convective heat transfer coefficient increases 14 % and 11% and the bottom temperature of the heat sink decreases 2.2˚C and 1.6˚C by using Al 2 O 3 -H 2 O and Tio2-H 2 O nanofluid instead of pure distilled water, respectively.

Research paper thumbnail of Hydrodynamics and heat transfer characteristics of a novel heat exchanger with delta-winglet vortex generators

Chemical Engineering Science, 2010

CITATIONS 0 READS 163 4 authors, including: Some of the authors of this publication are also work... more CITATIONS 0 READS 163 4 authors, including: Some of the authors of this publication are also working on these related projects: combustion, battery pack cooling with PCM and metal foam, miniature heat sink with ferrofluid under alternate magnetic field View project Abstract In this paper thermal and hydrodynamic performances of a miniature tangential heat sink are investigated experimentally by using Al 2 O 3 -H 2 O and Tio 2 -H 2 O nanofluids. The effects of flow rate and volume concentration on the thermal performance have been investigated for the Reynolds number range of 210 to 1100. Experimental results show that the average convective heat transfer coefficient increases 14 % and 11% and the bottom temperature of the heat sink decreases 2.2˚C and 1.6˚C by using Al 2 O 3 -H 2 O and Tio2-H 2 O nanofluid instead of pure distilled water, respectively.

Research paper thumbnail of A numerical investigation on thermal performance of a plate pin fin heat sink using Al2O3 –H2O nanofluid

In this research, thermal and hydrodynamic performance of nanofluids impinging jet on plate pin-f... more In this research, thermal and hydrodynamic performance of nanofluids impinging jet on plate pin-fin heat sink (PPFHS) was studied using commercial software FLUENT. Nanoparticles and the base fluid are considered Al2O3 and water, respectively. Performance of the PPFHS was studied for nanofluids in four different volume concentrations (0.5, 1, 1.5 and 2%) compared to base fluid (water). The PPFHS is composed of five rectangular channels which within each there is a three-pin circular cross-section with a direct arrangement. Nanofluids impinging jet flow regime in the PPFHS is laminar. Also a constant heat flux is applied to the bottom surface of PPFHS. Based on the results of numerical simulations, it has been seen that with increasing Reynolds number and the volume fraction of nanoparticles in the base fluid, the average convective heat transfer coefficient increased by up to 16.49% at 2% volume concentration. Also, thermal resistance decreases by increasing nanofluids volume concentration and Reynolds number. Also, the pumping power increases with increasing volume fraction of aluminum oxide nanoparticles in water-base fluid. Although the numerical results indicate increasing the pumping power up to 48.15%, for alumina nanofluids with volume concentrations of 2% compared to base fluid (water), but there is an increase in the average heat transfer coefficient of PPFHS up to 16.49% and reduce in the thermal resistance of the PPFHS up to 20.4% for alumina nanofluids with volume concentrations of 2% compared to base fluid, so this finds show usability of nanofluids in improving the heat transfer performance of the PPFHS and cooling it.

Research paper thumbnail of Hydrodynamics and Heat Transfer Characteristics of a Miniature Plate Pin-Fin Heat Sink Utilizing Al2O3-Water and TiO2-Water Nanofluids

In this paper, the hydrodynamic and thermal performance of a miniature plate pin finned heat sink... more In this paper, the hydrodynamic and thermal performance of a miniature plate pin finned heat sink is investigated experimentally by utilizing two widely used nanofluids, Al2O3-water and TiO2-water. The heat sink base plate which is used in the cooling process of electronic devices, has the dimensions of 42 mm (L)×42 mm (W)×14 mm (H) and is made of Aluminum and placed in a plexiglass case which is isolated from the environment using an insulator foam. The thermal performance of the heat sink is investigated by passing the nanofluid at constant inlet temperature while applying a constant heat flux of 124.8 kW/m2 to the bottom surface of the heat sink. The nanofluids are prepared in volume concentrations of 0.5, 1, 1.5, and 2 percent and their performances are measured considering water as the base fluid. Measuring the pressure difference between the entrance and exit of the heat sink made it possible to study the hydrodynamic performance of the heat sink. Although the measurements showed 15% and 30% increase in the pumping power for the volume concentration of 2 % of Al2O3-water and TiO2-water nanofluids, respectively, the average heat transfer coefficients increased by 16% and 14% and the thermal resistance decreased by 17% and 14% for each nanofluid.