Heat Transfer Enhancement in Automobile Radiator using Nanofluids: A Review Student, IV semester M. Tech (Heat power engineering (original) (raw)
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IJERT-Heat Transfer Enhancement in Automobile Radiator using Nanofluids: A Review
International Journal of Engineering Research and Technology (IJERT), 2014
https://www.ijert.org/heat-transfer-enhancement-in-automobile-radiator-using-nanofluids-a-review https://www.ijert.org/research/heat-transfer-enhancement-in-automobile-radiator-using-nanofluids-a-review-IJERTV3IS030433.pdf In the development of the many modern technology the primary challenge is thermal management. If we are looking towards the automobile sector the thermal management is the most difficult challenge. Nanofluids are suspension of metallic or nonmetallic nanoparticles in the base fluid; it can be used to increase the heat transfer rate of various applications such as internal cooling system of gas turbine blades, cooling system for automobile engine. This paper contains the literature survey which gives the techniques to implementation of the nanofluids in the car radiator for the cooling of engine.
Analysis of Thermal Performance of a Car Radiator Employing Nanofluid
International Journal of Mechanical Engineering and Applications, 2014
In this study, thermal performance of a car radiator with employment of Ethylene Glycol/copper nanofluid in disparate environmental conditions has been investigated. The governing equations for heat transfer in the car radiator have been written and solved by using a generated computer code in different environmental states and the changes in the output nanofluid temperature have been studied. It has been shown that by increasing the values of volume fraction of nano-particles and also, Reynolds number of inlet air, one can observe a raise in the values of overall heat transfer coefficient of the air side and the rate of heat transfer. Furthermore, it is observed that by adding nano-sized particles to the coolant fluid in radiator, one can significantly reduce its output temperature. In addition, it has been demonstrated that by adding 5% of nano-particles to the coolant fluid, thermal performance of the radiator in a hot weather of 50˚ C can be better than its performance in the weather of 20˚C.
Performance Investigation of an Automotive Car Radiator Operated With Nanofluid as a Coolant
Journal of Thermal Science and Engineering Applications, 2013
Water and ethylene glycol as conventional coolants have been widely used in an automotive car radiator for many years. These heat transfer fluids offer low thermal conductivity. With the advancement of nanotechnology, the new generation of heat transfer fluids called, "nanofluids" have been developed and researchers found that these fluids offer higher thermal conductivity compared to that of conventional coolants. This study focused on the application of ethylene glycol based copper nanofluids in an automotive cooling system. Relevant input data, nanofluid properties and empirical correlations were obtained from literatures to investigate the heat transfer enhancement of an automotive car radiator operated with nanofluid-based coolants. It was observed that, overall heat transfer coefficient and heat transfer rate in engine cooling system increased with the usage of nanofluids (with ethylene glycol the basefluid) compared to ethylene glycol (i.e. basefluid) alone. It is observed that, about 3.8% of heat transfer enhancement could be achieved with the addition of 2% copper particles in a basefluid at the Reynolds number of 6000 and 5000 for air and coolant respectively. In addition, the reduction of air frontal area was estimated.
Applied Thermal Engineering, 2010
Water and ethylene glycol as conventional coolants have been widely used in an automotive car radiator for many years. These heat transfer fluids offer low thermal conductivity. With the advancement of nanotechnology, the new generation of heat transfer fluids called, "nanofluids" have been developed and researchers found that these fluids offer higher thermal conductivity compared to that of conventional coolants. This study focused on the application of ethylene glycol based copper nanofluids in an automotive cooling system. Relevant input data, nanofluid properties and empirical correlations were obtained from literatures to investigate the heat transfer enhancement of an automotive car radiator operated with nanofluid-based coolants. It was observed that, overall heat transfer coefficient and heat transfer rate in engine cooling system increased with the usage of nanofluids (with ethylene glycol the basefluid) compared to ethylene glycol (i.e. basefluid) alone. It is observed that, about 3.8% of heat transfer enhancement could be achieved with the addition of 2% copper particles in a basefluid at the Reynolds number of 6000 and 5000 for air and coolant respectively. In addition, the reduction of air frontal area was estimated.
2015
Mixture of water and ethylene glycol as conventional coolants has been widely used in an Automobile radiator for many years. These heat transfer fluids offer low thermal conductivity. With the advancement of nanotechnology, the new generation of heat transfer fluids called, "nanofluids" have been developed and researchers found that these fluids offer higher thermal conductivity compared to that of conventional coolants. Consistent technological development in automotive industries has increased the demand for high efficiency engines. A high efficiency engine is not only based on its performance but also for better fuel economy and less emission. Reducing a vehicle weight by optimizing design and size of a radiator is a necessity for making the world green. Addition of fins is one of the approaches to increase the cooling rate of the radiator. It provides greater heat transfer area and enhances the air convective heat transfer coefficient. However, traditional approach of ...
Performance analysis of automobile radiator operated with Nanofluid based coolant
Mixture of water and ethylene glycol as conventional coolants has been widely used in an Automobile radiator for many years. These heat transfer fluids offer low thermal conductivity. With the advancement of nanotechnology, the new generation of heat transfer fluids called, "nanofluids" have been developed and researchers found that these fluids offer higher thermal conductivity compared to that of conventional coolants. This study focused on the application of mixture ethylene glycol+water (50:50) combination based Al 2 O 3 nanofluids in an automotive cooling system. Relevant input data, nanofluid properties and empirical correlations were obtained from literatures to investigate the heat transfer enhancement of Automobile radiator operated with nanofluid-based coolants. It was observed that, overall heat transfer coefficient and heat transfer rate in engine cooling system increased with the usage of nanofluids (with mixture of ethylene glycol+water (50:50) combination the base fluid) compared to mixture of ethylene glycol +water (50:50) combination (i.e. basefluid) alone. It is observed that, about 70% of heat transfer enhancement could be achieved with the addition of 1% Al 2 O 3 particles in a basefluid at the constant air Reynolds number and coolant Reynolds number( mass flow rate 5LPM) respectively. In addition, the reduction of air frontal area was estimated Nomenclature A fr = frontal area of Automobile radiator D ha = Hydraulic diameter of Tubes m G = mass velocity Kg/m 2 s T = Temperature deg C H = Total water Flow length m = dynamic viscosity N/sm 2 H = Heat transfer coefficient W /m 2 K f= fanning fraction factor J= Colburn factor Dimensionless subscripts K = Thermal conductivity W/m K bf= base fluid Qt = total heat transfer W/m 2 K nf= nanofluid U= overall heat transfer based on air side W/m 2 K p =particle m = mass flow rate (kg/s) ai= air inlet P= Pressure drop nfo = outlet P= Pumping power nfi= nanofluid inlet Re= Reynolds number = effectiveness = Volume fraction V= Velocity of Fluid passing through radiator m/s = Density Kg/m 3
Heat-Transfer Enhancement of Nanofluids in a Car Radiator Izbolj
2018
In recent times, enhancing the efficiency of automobiles has become very important. As part of this effort, increasing the efficiency of the heat transfer in the radiator of an automobile is also crucial. The present approach involves an addition of nanoparticles to the cooling liquid. Most of the current results were obtained using a few types of nanoparticles. Only a limited amount of work involved hybrid nanofluids including several types of nanoparticles. Multi-walled carbon nanotubes (MWCNT) were used along with aluminium-oxide nanoparticles to form a nanofluid with the base fluid (ethylene glycol (EG) + distilled water (DW) – 1:1 ratio) having volume concentrations of (0.03, 0.06, 0.09 and 0.12) %. The characterization of the nanoparticles was carried out. The experiments were carried out at inlet temperatures of 40–75 °C, with increments of 5 °C. The volume flow rate was varied from 0.6 m/h to 0.96 m/h, with increments of 0.12 m/h. An increase in the heat transfer of 35 % was...
Study of Heat Transfer Characteristics of Nanofluids in an Automotive Radiator
IOP Conference Series: Materials Science and Engineering, 2018
This paper presents an experimental study on heat transfer using nanofluid as coolants in engines. Previous studies shows that Al2O3 is found to be more effective in heat transfer due to its high conductive property which is found to increase with concentration. Particles having diameter in the range 10-3 to 10-6 m have low thermal conductivities and cause clogging in the flow section along with significant friction and are highly unstable in solution. Nanoparticles on the other hand are easily dispersed and cause minimal clogging or friction in the flow. In the present work, ethylene glycol-water solution is taken as a base fluid for nanoparticle dispersion. The ratio of water to ethylene glycol used is 80:20 and it has been noted out that heat conduction improved with increasing fraction of ethylene glycol. The experiments were conducted with flow rate of 4,5,6 and 7 L/min and the air flow rate inside the duct was kept constant at 4.9 m/s. The temperature of water in the reservoir is kept at 70°C. The nanoparticles used in this experiment are Cu and TiO2 having particle size less than 80nm. Result shows that there is an improvement of 24.5% in the overall heat transfer coefficient and there was also an increase of 13.9% in the heat transfer rate compared to the base fluid (80:20 Water: EG solution).
Performance investigation of Automobile Radiator operated with Nanofluids Based Coolant
2014
Traditionally forced convection heat transfer in a Automobile radiator is performed to cool circulating fluid which consisted of water or a mixture of water and anti-freezing materials like ethylene glycol (EG). In this paper, the heat transfer performance of binary mixture EG+ water (50 %) volume concentration. Furthermore, different amounts of Al2O3 nano particle have been added into these base fluids and its effects on the heat transfer performance of the Automobile radiator have been determined experimentally. Air Reynolds number has been changed in the range of 84391-91290 and the fluid inlet temperature has been constant for all the experiments and mass flow rate of the coolant flowing through the radiator. The results demonstrate that nanofluids clearly enhance heat transfer compared to their own base fluid. In the best conditions, the heat transfer enhancement of about 70% compared to the base fluids has been recorded.
Heat-transfer enhancement of nanofluids in a car radiator
Materiali in tehnologije, 2018
In recent times, enhancing the efficiency of automobiles has become very important. As part of this effort, increasing the efficiency of the heat transfer in the radiator of an automobile is also crucial. The present approach involves an addition of nanoparticles to the cooling liquid. Most of the current results were obtained using a few types of nanoparticles. Only a limited amount of work involved hybrid nanofluids including several types of nanoparticles. Multi-walled carbon nanotubes (MWCNT) were used along with aluminium-oxide nanoparticles to form a nanofluid with the base fluid (ethylene glycol (EG) + distilled water (DW)-1:1 ratio) having volume concentrations of (0.03, 0.06, 0.09 and 0.12) %. The characterization of the nanoparticles was carried out. The experiments were carried out at inlet temperatures of 40-75°C, with increments of 5°C. The volume flow rate was varied from 0.6 m 3 /h to 0.96 m 3 /h, with increments of 0.12 m 3 /h. An increase in the heat transfer of 35 % was achieved.