Using of Multi-Wall Carbon Nanotube (MWCNT) Based Nanofluid in the Heat Pipe to Get Better Thermal Performance (original) (raw)
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INVESTIGATION ON THERMAL PERFORMANCE OF HEAT PIPE USING NANOFLUID: A REVIEW
IJAERD, 2018
Nanofluids have been the subject of intensive study worldwide since pioneering researchers recently discovered the anomalous thermal behaviour of these fluids. Comprehensive research work on heat transfer in heat pipe using nanofluids have been experimentally and theoretically investigated in recent years by various researchers. The suspended nanoparticles effectively enhance the heat transfer characteristics and the transport properties of base fluids in heat pipes. The objective of this paper is to present an overview of literature dealing with influence of various factors such as heat pipe tilt angle, charged amount of working fluid, nanoparticle type, size and concentration, mass/ volume fraction & its effect on the thermal efficiency, heat transfer capacity & reduction in thermal resistance.
Thermal performance of cylindrical heat pipe using nanofluids
Journal of thermophysics …, 2010
Acylindrical copper heat pipe with a 19.5mmouter diameter and a 400.0mmlength was filled with three different working fluids and tested for different heat inputs in the range of 100–250 W. The working fluids tested were de-ionized water, silver–water colloid, and copper water. Experimental results showed that the wall temperature reduction obtained was 3–27C. The efficiency of the heat pipe was enhanced by 14% as compared with the heat pipe filled with the base fluid. Furthermore, it was found that an increase in the metal fraction in copper–water nanofluids lead to enhancement in thermal efficiency of the heat pipe. Thermal conductivities of copper–water nanofluids were measured, showing a 30% enhancement with a 0.1 wt%of copper nanoparticles.
Effect of Nanofluid Concentration on the Performance of Circular Heat Pipe
The goal of this paper is to experimentally study the behavior of nanofluid to improve the performance of a circular heat pipe. Pure water and Al2O3-water based nanofluid are used as working fluids. An experimental setup is designed and constructed to study the heat pipe performance under different operating conditions. The effect of filling ratio, volume fraction of nano-particle in the base fluid, and heat input rate on the thermal resistance is investigated. Total thermal resistance of the heat pipe for pure water and Al2O3-water based nanofluid is also predicted. An experimental correlation is obtained to predict the influence of Prandtl number and dimensionless heat transfer rate, Kq on thermal resistance. Thermal resistance decreases with increasing Al2O3-water based nanofluid compared to that of pure water. The experimental data is compared to the available data from previous work. The agreement is found to be fairly good.
A comprehensive study of the performance of a heat pipe by using of various nanofluids
Science Direct, 2017
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The Experimental Study of the Thermal Performance of Heat Pipe using CuO/Water Nanofluid.
International Journal of Engineering Sciences & Research Technology, 2013
This paper presents the enhancement of the thermal performance of a heat pipe charged with nanofluid. The CuO/Water nanofluid served as the working fluid with three concentrations by volume 1g/L, 5g/L and 10g/L in heat pipe. The heat pipe is fabricated by a straight copper tube with an outer diameter 18 mm, thickness 1mm and length of 475 mm. This paper presents a discussion on the effect of various performing parameters by varying different heat inputs as well as fluid concentration as mentioned above. The nanoparticles have observed significant effect on the enhancement of thermal performance of heat pipe by increasing fluid concentration as well as different heat inputs. Experimental results show that at a heating power of 80 W, the optimal thermal conductivity and heat transfer rate for CuO/Water nanofluid heat pipe are 50.46% and 1.75% respectively, which are better than that of pipes using pure water as the working fluid. Nomenclature: dx: Thickness (m) dT: Temperature difference ( 0C ) k: Thermal conductivity [W/m K] R HP : Total thermal resistance (ᶿC/W) A s : Surface Area (m 2 ) V HP : Total Volume of heat pipe (L) D: Outer diameter (m) t: Thickness (m) k HP : Overall thermal conductivity of heat pipe (W/m 0 C) L: Length of the heat pipe (m) Qin: Heat transfer rate (heating power) (W) V: Voltage (V)
Heat Transfer Enhancement in Heat Pipe Using Nanofluid – A Review
— For enhancement of heat transfer in heat pipe, Nano fluid found vital role and a new frontier in various engineering applications. This paper reviews and summarizes the work on heat pipes using nano fluids as a working medium. Various types of nano particle with different base fluids as proved its potential to improve thermal properties of working medium in heat pipe. The effect of filling ratio, volume fraction of nano practices on thermal performance in various kinds of heat pipe with different base fluids under various operating conditions has been discussed. Mechanism of enhancement of heat transfer after utilization of nano fluids in heat pipe has been explained. Also, influence of dimensionless on thermal resistance in terms of correlation has been studied. This paper discusses relativity of total heat resistance between the heat pipe with nano fluid and with existing fluids. Focusing towards the application this paper suggests the suitability of heat pipes in various heat generation problems.
An investigation of the thermal performance of cylindrical heat pipes using nanofluids
… Journal of Heat and Mass Transfer, 2010
In this work, a two-dimensional analysis is used to study the thermal performance of a cylindrical heat pipe utilizing nanofluids. Three of the most common nanoparticles, namely Al 2 O 3 , CuO, and TiO 2 are considered as the working fluid. A substantial change in the heat pipe thermal resistance, temperature distribution, and maximum capillary heat transfer of the heat pipe is observed when using a nanofluid. The nanoparticles within the liquid enhance the thermal performance of the heat pipe by reducing the thermal resistance while enhancing the maximum heat load it can carry. The existence of an optimum mass concentration for nanoparticles in maximizing the heat transfer limit is established. The effect of particle size on the thermal performance of the heat pipe is also investigated. It is found that smaller particles have a more pronounced effect on the temperature gradient along the heat pipe.
Thermal Performance of a cylindrical heat pipe using nano fluids
A cylindrical copper heat pipe with a 19.5 mm outer diameter and a 400.0 mm length was filled with three different working fluids and tested for different heat inputs in the range of 100-250 W. The working fluids tested were de-ionized water, silver-water colloid, and copper water. Experimental results showed that the wall temperature reduction obtained was 3-27 C. The efficiency of the heat pipe was enhanced by 14% as compared with the heat pipe filled with the base fluid. Furthermore, it was found that an increase in the metal fraction in copper-water nanofluids lead to enhancement in thermal efficiency of the heat pipe. Thermal conductivities of copper-water nanofluids were measured, showing a 30% enhancement with a 0.1 wt % of copper nanoparticles.
2017
Experimental Studies of Heat Transfer of CNT (Carbon Nano Tube) Water based Nanofluid in a Shell and Tube Heat Exchanger and double pipe heat exchanger has been performed by varying flow rate and concentration of nanoparticles from 2 LPM to 4 LPM and 0.1% to 0.3% by volume respectively at ambient temperature. The increment in heat transfer coefficient was determined for both cases and compared. It was found that the increment in heat transfer performance in shell and tube heat exchanger is better in comparison to double pipe heat exchanger.
A Review of Performance of Heat Pipe with Nanofluids
With the modern era of miniaturization of equipments, heat pipes have attracted major attention in the field of heat transfer. Nanofluids also have attracted a notable attention in recent days due to its superior heat transport properties. This review aim to compile the effect of nanofluid in heat pipes. Performance of different nanoparticles and different base-fluids are investigated. Most of the papers reviewed here reported an enhancement in performance of heat pipes. Existence of an optimum concentration of nanoparticles in base fluid was also reported. Paper also presents a perspective on possible research application.