scholarly journals Thermophysical Properties of Hybrid Nano Fluids

2019 ◽  
Vol 9 (1) ◽  
pp. 5038-5040
Keyword(s):  
Thermophysical Properties ◽  
Acid Treatment ◽  
Nano Particles ◽  
Agriculture Waste ◽  
Nano Fluid ◽  
Bamboo Leaves ◽  
Pure Sio2 ◽  
Nano Fluids

In this study, the ash from agriculture waste of bamboo leaves was used in the synthesis of silica nano particles followed by leaching and acid treatment. The required ash from agriculture waste (bamboo leaves) is subjected to sintered at 700 degree centigrade for 5 hours to eliminate residues from ash. The obtained powder was treated with 1M NaOH for leaching and then acid- treatment with 0.5 M H2SO4 to precipitate pure SiO2 nano particles powder. The synthesized silica were characterized by XRD, FTIR, SEM, PSA, ZETA POTENSIAL. And the synthesis of CuO-SiO2 hybrid nano fluid from the agriculture waste of silica.

Impact of nano-particles shapes on Al2O3-water nano-fluid flow due to a stretching cylinder

2019 ◽  
Vol 30 (5) ◽  
pp. 2809-2832 ◽  
Author(s):  
Sajjad Haider ◽  
Adnan Saeed Butt ◽  
Imran Syed Muhammad ◽  
Asif Ali ◽  
Yun-Zhang Li ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Nano Particles ◽  
Stretching Cylinder ◽  
Nano Particle ◽  
Heat Transmission ◽  
Content Type ◽  
Nano Fluid ◽  
Layer Flow ◽  
Particle Shapes ◽  
Nano Fluids

Purpose The purpose of this study is to theoretically probe the shape impacts of nano-particle on boundary layer flow of nano-fluid toward a stretching cylinder with heat-transmission effects. The base fluid used for this study is pure water, and aluminum oxide nano-particles are suspended in it. Four different shapes of nano-particle, namely, cylindrical, brick, platelets and blades, are considered to carry out the study. Design/methodology/approach The problem is modelled mathematically and the nonlinear system of equations is attained by using appropriate transmutations. The solution of transmuted equations is achieved by utilizing a shooting technique with Fourth-Fifth order Runge–Kutta Fehlberg scheme. Numerically attained results are elucidated through graphs and tables which are further compared under limiting cases with existing literature to check the validity of the results. Findings It is observed that fluid velocity and temperature of cylindrical shaped water nano-fluids are more than the nano-fluid having brick-shaped nano-particles. Moreover, it is seen that the nano-fluids suspended with platelets-shaped nano-particles have higher velocity and temperature than the nano-fluids containing blade-shaped nano-particles. The curvature parameter and nano-particles volume fraction have increasing effects on flow velocity and temperature of nano-fluids containing all types of nano-particle shapes. Originality/value Numerous authors have examined the impacts of nano-particle shapes on characteristics of heat transfer and fluid flow. However, to the best of the authors’ knowledge, the shape impacts of nano-particles on boundary layer flow of nano-fluid toward a stretching cylinder with heat-transmission effects have not been discussed. So, to fulfill this gap, the present paper explicates the impacts of various nano-particle shapes on Al2O3–water-based nano-fluid flow past a stretching cylinder with heat-transfer effects.

scholarly journals Thermo-Acoustical and FTIR Spectroscopic Research of Nanofluids at Different Temperatures

2020 ◽  
Vol 8 (5) ◽  
pp. 5306-5309
Keyword(s):  
Thermal Conductivity ◽  
Bond Formation ◽  
Nano Particles ◽  
Wide Spread ◽  
Nano Fluid ◽  
Cohesive Properties ◽  
Physical Chemical ◽  
Different Temperatures ◽  
Chemical Studies ◽  
Nano Fluids

In recent years the greater interest of increase in thermal conductivity have attracted because there is comparison to that of the base fluids by Nano fluids. The wide spread of nano particles of the formation nano fluid of a base fluid, takes place. These nano fluids are very much useful in thermo dynamical applications and in the study of so many physical-chemical studies. The properties of molecular of sound in nano fluids like transmission undergo changes of associated systems in highly dependent and the cohesive properties of liquids. Generally nano fluid is having high thermal conductivity values. Four different temperatures have been studied in this thermo-acoustical work and FTIR Spectrum of Coo Nano fluid at T (303.15, 308.15, 313.15 and 318.15) K. The observed results are explained in the nature of interactions and bond formation.

scholarly journals Performance Improvement of Base Fluid Heat Transfer Medium Using Nano Fluid Particles

2020 ◽  
Vol 23 (4) ◽  
pp. 235-243
Author(s):  
T. Sathish
Keyword(s):  
Heat Transfer ◽  
Performance Improvement ◽  
Base Fluid ◽  
Flow Problem ◽  
Thermal Characteristics ◽  
Nano Particles ◽  
Simulation Tool ◽  
Heat Transfer Medium ◽  
Nano Fluid ◽  
Nano Fluids

Base fluids like water, ethylene glycolandengineoilare conventionally used as a heat transfer medium. The performance of heat transferred is improved in the conventional fluids with the addition of Nano particles. Hence, this paper considers the forced conventional flow problem over the base fluid within a uniform heated tube placed on a wall. The analysis of heattransferco-efficientis done through a constant Reynoldsnumberfor both Nano and base fluid with a simulation tool. Further, a comparative analysis is carried out with heat transfer coefficient over the base and various Nano fluids. It is seen that the Nano fluids has a better performance due to its better thermal characteristics under standard conditions.

Conjugate Heat Transfer in a Hexagonal Micro Channel Using Hybrid Nano Fluids

2016 ◽  
Author(s):  
Shreyas S. Hegde ◽  
Narendran Ganesan ◽  
N. Gnanasekaran
Keyword(s):  
Heat Transfer ◽  
Surface Roughness ◽  
Heat Transfer Coefficient ◽  
Pressure Drop ◽  
Conjugate Heat Transfer ◽  
Nano Particles ◽  
Micro Channel ◽  
Nano Fluid ◽  
Nano Fluids ◽  
Effect Of Surface

Research is being focused on the use of micro channels with nano fluids as the heat sinks. This requires fundamental understanding of the heat transfer phenomenon in micro channels. The objective of this paper is to present results from a numerical study on laminar forced convection in a Hexagonal Micro Channel (HMC) heat sink. In particular, the numerical study is carried out using a single phase model. The fluid considered is Alumina-Copper hybrid Nano fluid. The performance of Al2O3+Cu+water is compared with Al2O3+water nano fluid and pure water with different volume fractions. The solid region of the channel is assumed as aluminum with a hydraulic diameter of 175μm. The solid and fluid regions of the micro channel are discretized using finite volume method by combining Navier Stokes equation and energy equation for conjugate heat transfer. The thermo physical properties for alumina nanoparticles are calculated by considering it as a spherical particle of 45nm diameter. The effect of surface roughness on convective heat transfer coefficient and pressure drop for the case of nano fluids is also considered. The analysis is further extended by adding pulsating input and by varying the velocity sinusoidally. The Brownian motion of nano particles is increased to study the efficiency of the heat sink. This ensures all the nano particles are in suspension and the randomness increases the micro convection in the fluid. Incorporating the pulsating flow increases the dispersion of the heat in the nano fluid at a faster rate and also decreases particle settlement in laminar flow. The combined effect of surface roughness and pulsating flow accounts for the change in the velocity profile and thermal boundary layer of the channel. Also the effect of surface roughness ranging from 0.2–0.6 is attempted and the variations in pressure drop, Nusselt number, and heat transfer coefficient are studied. The influence of hexagonal geometry and its interaction with alumina nano fluids is intensively studied by evaluating a three dimensional conjugate heat transfer model. The effect of side wall angle of 45°, 50° and 55° are computed to relate the velocity function with pressure drop, surface roughness and local heat transfer coefficient. The variation of Nusselt number with very low volume fraction of nano particles with a minimal amount of pressure drop is also presented.

scholarly journals Improvement of Drag Reduction for Water Flow in Pipe Based Nanofluid

2020 ◽  
Vol 27 (1) ◽  
pp. 44-49
Author(s):  
Thamer Jasim Mohammed ◽  
Ellaf Khaled Abbass
Keyword(s):  
Drag Reduction ◽  
Flow Rate ◽  
Tap Water ◽  
Pure Water ◽  
Nano Particles ◽  
Nano Fluid ◽  
Friction Factors ◽  
Stainless Steel Pipe ◽  
Maximum Drag Reduction ◽  
Nano Fluids

In the present work, the effect of Nano fluids as drag reducing agents for water flowing in pipelines was studied. Tap water was chosen to be the tested liquid and the Nano fluid was a dilute solution of water and titanium dioxide (TiO2) Nano particles which was used at five different concentrations (50, 100, 150, 200, and 250) ppm. The test section of the experimental setup consisted of a stainless steel pipe of 29.6 mm I.D (DN25) and 1.2 m long.  Water was pumped with eight different flow rates (1.0 - 8.0 m3/hr) through the pipe at room temperature (35±1) o C. The effect of the nano particle concentration and the flow rate (or Reynolds number) on percentage drag reduction (%Dr) and flow rate increases (%FI) was examined. Generally, a gradual increase of %Dr &%FI was observed with increasing the NP concentration and bulk velocity. The highest TiO2 concentration of 250 ppm and Re.No. of 106230 offered the maximum drag reduction which was 29.7%. Friction factors were also calculated from experimental data. Their values for pure water transported lies near or at Blasuis asymptote. While by introducing the additives, their values were positioned below Blasuis asymptotes towards Virk maximum drag reduction asymptotes.

scholarly journals Use of Nano Fluids in Nuclear Technology: A Review

2021 ◽  
Vol 64 (2) ◽  
pp. 149-160
Author(s):  
Tahir Iqbal ◽  
Maria Zafar ◽  
Mohsin Ijaz
Keyword(s):  
Heat Transfer ◽  
Nuclear Reactors ◽  
Industrial Applications ◽  
Nano Particles ◽  
Transfer Property ◽  
Nano Fluid ◽  
Heat Transfer Property ◽  
Wide Range ◽  
Transfer Properties ◽  
Nano Fluids

Nuclear energy is the most important source to produce electricity. The production processes are very important for reducing risks and increasing the efficiency. Nano-fluids also have the potential to transfer heat with improved thermo-physical properties which can be applicable in many devices for better performance. Advancement in nanotechnology develops new fluids which transfer heat called nano-fluids. So, for heat exchange in the core of nuclear reactors, nano-fluids are used because of their unique heat transfer properties. For significant improvement in properties, the modest concentration of nano-particles is required. Recent research is more about behaviour of nano-fluids to utilize their unique properties. Heat transfer property is very important for industrial applications, nuclear reactors, transportation, and electronics and also in biomedicine. Nano-fluid acts like smart fluid, where heat transfer property can be controlled. This review establishes a focus on the wide range of recent and future uses about nano-fluids, related to their improved properties of heat transfer that may be controllable and other specific properties of nano- fluids.    

scholarly journals Experimental investigation on the influence of nano-fluids used as HTF in PCM based thermal energy storage system

2020 ◽  
pp. 60-60
Author(s):  
Krishna Reddy ◽  
Meenakshi Reddy ◽  
Durga Prasad
Keyword(s):  
Stearic Acid ◽  
Volume Concentration ◽  
Storage System ◽  
Energy Storage System ◽  
Hot Water ◽  
Paraffin Wax ◽  
Nano Fluid ◽  
Working Medium ◽  
Thermal Energy Storage System ◽  
Nano Fluids

The present study investigated the enhancement of energy conservation under the principles of pure substances that exercise phase change throughout charging and discharging processes. This work primarily focused on the thermal energy storage system, where the working medium charges the PCM?s namely (Paraffin wax & stearic acid) that is normally encapsulated in spherical balls. The potentiality in charging of working medium was examined upon blending HTF (heat transfer fluid) with four nano-particles (Al2O3, CuO, TiO2 & MgO). Several volume concentration levels (0.2%, 0.5% and 0.8%) were considered for afore mentioned nanoparticles under the influence of assumed flow rates (2l/min, 4l/min and 6l/min). The experiments were carried out with various nano-fluids used as HTF for different flow rates and volume concentrations. The results showed that there is a considerable amount of reduction in charging time, in case of 6 l/min, 0.8% volume concentration and PCM as Paraffin wax, around 27.22 % for TiO2 nano-fluid, 36.66% for Al2O3 nano-fluid, 40.90% for CuO nano-fluid and 63.63% for MgO nano-fluid, and PCM used as Stearic acid, around 26.31 % for TiO2 nano-fluid, 42.10% for Al2O3 nanofluid, 47.36% for CuO nano-fluid and 68.42% for MgO nano-fluid, when compared with the conventional HTF, water. From the results, it was observed that the effect of particle concentration played an important role in the heat transfer process. During the discharging process, 210 liters of hot water withdrawn with paraffin wax used as PCM and 198 liters of hot water withdrawn with stearic acid used as PCM.

scholarly journals Studies on Thermal Degradation Behavior of Siliceous Agriculture Waste (Rice Husk, Wheat Husk and Bagasse)

2015 ◽  
Vol 17 (3) ◽  
pp. 47-51 ◽  
Author(s):  
Syed H. Javed ◽  
Umair Aslam ◽  
Mohsin Kazmi ◽  
Masooma Rustam ◽  
Sheema Riaz ◽  
...  
Keyword(s):  
Thermal Degradation ◽  
Rice Husk ◽  
Acid Treatment ◽  
Proximate Analysis ◽  
Degradation Behavior ◽  
Agriculture Waste ◽  
Pure Silica ◽  
Thermal Degradation Behavior ◽  
Residual Weight ◽  
Wheat Husk

Abstract Various siliceous agriculture waste (SAW) such as rice husk, wheat husk and bagasse have been investigated to study their thermal degradation behavior using Thermogravimetric Analyzer (TGA) technique. The focus of this research is to conduct TGA of raw and acid treated (20% HCl & 1M H2SO4) SAW at heating rate 10°C/min in the atmosphere of nitrogen. The results were analyzed on the basis of thermograms and it was inferred that 24 hours soaking with 20% HCl prior to thermal degradation enhanced the percent weight loss. The process also improved the percentage of residual weight of SAW indicating the extraction of amorphous silica with increased purity. The effect of acid treatment was verified by determining chemical composition of SAW samples before and after soaking with 20% HCl. Proximate analysis, thermal degradation temperature ranges and percentage of residual weight at 800°C for each of rice husk, wheat husk and bagasse were also quantified to observe the thermal degradation behavior. XRF analysis was performed to observe the effect of acid treatment for extraction of pure silica.

Effect of Titanium Dioxide (Tio2) Nano-Fluid on Performance and Emission Features of a Diesel Engine Operated on Aphanizomenon Flos Biodiesel-Diesel Blend

2019 ◽  
Vol 969 ◽  
pp. 421-426
Author(s):  
G. Jayabalaji ◽  
P. Shanmughasundaram
Keyword(s):  
Titanium Dioxide ◽  
Diesel Engine ◽  
Nano Particles ◽  
Nano Particle ◽  
No Emission ◽  
Single Cylinder ◽  
Performance And Emission ◽  
Nano Fluid ◽  
Ci Engine

In this present investigation titanium dioxide (TiO2) nano-fluid was blended with aphanizomenon flos (AF) biodiesel (20%)-diesel (80%) blend. Different percentages of TiO2 such as 5%, 10%, and 15%, was added with AF-D (aphanizomenon flos-diesel) blends. The blends are named as AFD-5TiO2, AFD-10TiO2, and AFD-15TiO2. The performance and emission parameters of a single cylinder CI engine fueled with AFD-TiO2 blends were experimentally investigated. The results reveal that, with the use of TiO2 nano particles, AFD-10TiO2 blend gave optimum results. BSFC decreased by about 5% and BTE increased by about 2% with the addition of TiO2 nano-particle as a catalyst. The tailpipe emissions such as CO, HC, smoke reduced drastically, but the NO emission increased, with the use of TiO2 nano-particles.

Study on Chemical Reactivity Control of Liquid Sodium: Development of Nano-Fluid and Its Property and Applicability to FBR Plant

2008 ◽  
Author(s):  
Jun-Ichi Saito ◽  
Kuniaki Ara ◽  
Ken-Ichiro Sugiyama ◽  
Hiroshi Kitagawa ◽  
Haruyuki Nakano ◽  
...  
Keyword(s):  
Chemical Reactivity ◽  
Nano Particles ◽  
Liquid Sodium ◽  
Atomic Interaction ◽  
Nano Particle ◽  
Fast Breeder Reactor ◽  
Weak Point ◽  
High Chemical ◽  
Nano Fluid ◽  
High Chemical Reactivity

Liquid sodium is used as the coolant of the fast breeder reactor (FBR). A weak point of sodium is a high chemical reactivity with water or oxygen. So an idea of chemical reactivity suppression of liquid sodium itself is proposed. The idea is that nano-meter size particles (hereafter called nano-particles) are dispersed in liquid sodium, and an atomic interaction which is generated between nano-particle and sodium atoms is applied to suppress the chemical reactivity. We call sodium that has dispersed the nano-particle a Nano-fluid. Three key technologies which are the trial manufacture of Nano-fluid, the reaction property of the Nano-fluid and applicability of Nano-fluid to FBR Plant have been carried out to develop the Nano-fluid.

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