Heat Transfer Effect of CNT and Ethylene Glycol Based Nano-Fluid in Twisted Tape Heat Exchanger with Balls

2020 ◽  
Vol 12 (4) ◽  
Author(s):  
R. Saravanan ◽  
M. Karuppasamy ◽  
M. Chandrasekaran ◽  
V. Muthuraman
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Ethylene Glycol ◽  
Heat Exchangers ◽  
Twisted Tape ◽  
Heat Transfer Fluids ◽  
Nano Fluid ◽  
Carbon Nano Tubes ◽  
Heat Transfer Improvement ◽  
Nano Fluids

Heat transfer improvement is the main parameter in a heat exchanging equipment. Few methods to increase the coefficient of heat transfer is by creating the turbulence in heat exchanging elements and changing the heat transfer fluids. For current analysis of tube heat exchangers, tape inserts containing balls are implemented with nano-fluids in Carbon Nano Tubes (CNT) and ethylene glycol. 3D modelling and simulation of twisted tape heat exchanger with balls were carried out using Solidworks and ANSYS Workbench. Heat transfer rate, friction factor, temperature difference in the heat exchangers, Reynolds number and Nusselt number variations are assessed in this work.

scholarly journals Review: Observation on CFD Analysis of ZnO and TiO2 Nanofluid with Oil and Ethylene Glycol in Square and Helical Coil Heat Exchanger

2021 ◽  
Vol 9 (12) ◽  
pp. 503-507
Author(s):  
Rakesh Kumar
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Heat Exchangers ◽  
Helical Coil ◽  
Coiled Tube ◽  
Heat Transfer Fluids ◽  
Nano Fluid ◽  
High Heat Transfer ◽  
Compact Size ◽  
Coil Heat

Abstract: Helically coiled heat exchangers are globally used in various industrial applications for their high heat transfer performance and compact size. Nanofluids can provide the excellent thermal performance in helical coil heat exchangers. Research studies on heat transfer enhancement have gained serious momentum during recent years and have been proposed many techniques by different research groups [1]. A fluid with higher thermal conductivity has been developed to increase the efficiency of heat exchangers. The dispersion of 1-100nm sized solid nanoparticles in the traditional heat transfer fluids, termed as nanofluids, exhibit substantial higher convective heat transfer than that of traditional heat transfer fluids. Nanofluid is a heat transfer fluid which is the combination of nanoparticles and base fluid that can improve the performance of heat exchanger systems. In this present paper the efforts are made to understand that how to compare the heat transfer rate in Copper helically coiled tube and squared coiled tube heat exchanger using Zinc Oxide and Titanium Dioxide Nano fluid by studying research papers of various authors. Keywords: Helical Coil, Nano-fluid, Heat Exchanger, CFD, Pressure Drop, Temperature Distribution.

CFD Analysis of Twisted Tape Heat Exchanger with Twist Ratio of 3 in Metallic and Ceramic Nano Fluids

2020 ◽  
Vol 12 (3) ◽  
Author(s):  
M. Karuppasamy ◽  
R. Saravanan ◽  
M. Chandrasekaran ◽  
V. Muthuraman
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Heat Exchangers ◽  
Unit Length ◽  
Primary Objective ◽  
Heat Transfer Fluid ◽  
Twisted Tape ◽  
Tube Heat Exchanger ◽  
Nano Fluid ◽  
Twist Ratio

The heat transfer enhancement is primary objective in the heat exchangers. The heat exchangers are employed for cooling, heating and evaporation purposes in the industries. Many of the heat exchangers designed as the heat transfer fluid flow inside the tube. So, in this research, the double tube heat exchanger is considered with unit length. The passive method is one in which the flow resistance is to be introduced to enhance the heat transfer rate without affecting the pumping force. So, the tube inserts with twist ratio of 3 is considered. The water and water-copper oxide nano fluid and water-silicon dioxide nano fluid were considered for investigation. The flow properties such as pressure, temperature, velocity and turbulence kinetic energy were varied and discussed. The thermal performance, friction factor and enhancement factors are compared and discussed. The SiO2-water nano fluid has outperformed than the other fluids studied.

scholarly journals Performance of Heat Transfer and Friction Factor of Heat Exchanger with Al2o3/ Water Nano Fluids

2019 ◽  
Vol 9 (1) ◽  
pp. 2723-2726
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Heat Transfer Enhancement ◽  
Flow Characteristics ◽  
Plain Water ◽  
Twisted Tape ◽  
Transfer Enhancement ◽  
Nano Fluid ◽  
Fluids Mechanics ◽  
Nano Fluids

This paper summary of heat transfer characteristics and nano fluids mechanics by using single phase convection techniques. Gas having less thermal conductivity compare than the liquids having high thermal conductivity. The heat transfer enhancement improved by using nano fluids Al2O3 compared with base water. The heat transfer enhancement was analysed with plain tube and twisted tape inserts with nano fluids. The experimental investigation was analysed and reading was taken to improve the heat transfer and friction flow characteristics. The Reynolds number varies from different ranges with plain water and Nano fluids. The experimental record of nano fluid heat transfer value was increased with 2.89 percentage compare with the experimental record of plain water. The nano fluids has more concentration than the plain water.

scholarly journals Heat Transfer Enhancement by Using Different Types of Inserts

2014 ◽  
Vol 6 ◽  
pp. 250354 ◽  
Author(s):  
S. Tabatabaeikia ◽  
H. A. Mohammed ◽  
N. Nik-Ghazali ◽  
B. Shahizare
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Heat Transfer Enhancement ◽  
Heat Exchangers ◽  
Low Cost ◽  
Twisted Tape ◽  
Transfer Enhancement ◽  
Thermal Systems ◽  
Twisted Tapes ◽  
High Efficient

Heat transfer enhancement has been always a significantly interesting topic in order to develop high efficient, low cost, light weight, and small heat exchangers. The energy cost and environmental issue are also encouraging researchers to achieve better performance than the existing designs. Two of the most effective ways to achieve higher heat transfer rate in heat exchangers are using different kinds of inserts and modifying the heat exchanger tubes. There are different kinds of inserts employed in the heat exchanger tubes such as helical/twisted tapes, coiled wires, ribs/fins/baffles, and winglets. This paper presents an overview about the early studies on the improvement of the performance of thermal systems by using different kinds of inserts. Louvered strip insert had better function in backward flow compared to forward one. Modifying the shape of twisted tapes led to a higher efficiency in most of the cases excpet for perforated twisted tape and notched twisted tape. Combination of various inserts and tube with artificial roughness provided promising results. In case of using various propeller types, heat transfer enhancement was dependent on higher number of blades and blade angle and lower pitch ratio.

Intensification of Heat Transfer in a Double Tube Heat Exchanger with Nano-Fluids and Trapezoidal Cut Twisted Tape - A Numerical Study

2019 ◽  
Vol 11 (3) ◽  
Author(s):  
C. Gnanavel ◽  
R. Saravanan ◽  
M. Chandrasekaran
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Numerical Study ◽  
Beryllium Oxide ◽  
Nano Particles ◽  
Twisted Tape ◽  
Tube Heat Exchanger ◽  
Passive Technique ◽  
Energy Equations ◽  
Nano Fluids

The heat transfer enhancement is normally demanded in industries for heating, cooling and evaporation in the equipment’s like air conditioning, radiators and refrigerators etc. The passive, active or combination of them usually employed for intensification of heat transfer in such heat exchangers. In this study, we focus on an innovative passive technique. The dual approach is to increase the conductivity of the suspended nano-particles such as titanium dioxide, beryllium oxide or beryllia, zinc oxide and copper oxide in the water. The flow resistance is offered by inserting the twisted tape with trapezoidal cut. The objective of the numerical study is to investigate the thermal and flow fields by utilizing various types of nano-fluids with and without twisted tape in the double tube heat exchanger. The finite volume method is employed to solve the continuity, momentum and energy equations.

Study on the heat transfer improvement of double pipe concentric heat exchanger enhancement using twisted tape and nanofluids

2018 ◽  
Author(s):  
Suhanan ◽  
Risdian Harsanta Putra ◽  
Ardi Wiranata ◽  
Yosephus Ardean Kurnianto Prayitno ◽  
Muhammad Reza Pradecta
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Twisted Tape ◽  
Double Pipe ◽  
Heat Transfer Improvement

Design Implementation of the Intercooler System of the WR-21

2000 ◽  
Author(s):  
Phil A. Cabanos
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Ethylene Glycol ◽  
System Design ◽  
Heat Exchangers ◽  
Liquid System ◽  
Engine Operation ◽  
Turbine Engine ◽  
Liquid Heat ◽  
Pressure Compressor

This paper describes the design implementation of the Intercooler System of the WR-21 Intercooled Recuperated Gas Turbine Engine (ICR). The Intercooler System extracts heat from the gas exiting the Intermediate Pressure Compressor (IPC) by means of on-engine, air-to-liquid heat exchangers. The heat transfer liquid is 50/50 ethylene glycol/water (EG). The heat is carried out of the engine by the EG to an off-engine EG-to-seawater heat exchanger. The seawater ultimately dumps the heat into the sea. The ICR is designed primarily for ship application where space is at a premium. Three design innovations that provide solutions to operational and emergency problems, resulting in a compact off-engine skid assembly will be introduced. 1. A system design that will handle pump shut downs and allow engine operation while the intercooler is isolated (bypass mode) — without putting the liquid system outside the enclosure under pressure. 2. A reservoir that is vented to atmosphere, that is only about 130 gallons in volume, that provides make-up and allows flow of 800–1000 US gpm (3000–3785 l/min) without causing turbulence in the reservoir. 3. A device that removes slugs of air trapped in the system during initial fill-up and continually deaerates the system.

Effect of using graphene/water based nanofluid on heat transfer in heat exchangers with rotating straight inner tube

Kerntechnik ◽  
2021 ◽  
Vol 86 (1) ◽  
pp. 50-63
Author(s):  
T. Koca
Keyword(s):  
Heat Transfer ◽  
Nusselt Number ◽  
Heat Exchanger ◽  
Heat Transfer Enhancement ◽  
Heat Exchangers ◽  
Pure Water ◽  
Water Volume ◽  
Transfer Enhancement ◽  
Tube Heat Exchanger ◽  
Nano Fluids

Abstract In this research, the effect of nanofluids including graphite and water on the heat transfer enhancement in heat Exchangers with both straight and rotational inner tube were examined. Nano-fluids including graphite and water were obtained at 0.01, 0.02 and 0.03 %volume concentrations by means of pure water as a base fluid. The aim of the study is to experimentally investigate and compare the influence of straight inner tube on the performance of a double tube heat exchanger at different flow rates, different capacity ratios (0.25, 0.5, 0.75, 1), different rotation rates (0 RPM, 100 RPM, 150 RPM, 200 RPM, 300 RPM, 500 RPM and 750 RPM) and by using nanofluid including graphite and water volume at values of 0.01, 0.02, 0.03%. In the experiments the flow is turbulent. In order to determine the heat transfer enhancement, the experimental datas were compared for pure water and nano-fluids. According to the results, Nusselt number, pressure loss, efficiency of heat exchanger were gauge. By the results achieved from experiments, correlations for Nusselt number have been reproduce and experimental data have been compared with ones in the literature by drawing graphics. The experiment that provides the best increase in heat transfer is the nanofluid including 0.02% volume concentrations of graphene/water at 500RPM speed.

scholarly journals Analysis of Tube in Tube Heat Exchanger Fitted with Twisted Tape with Square Cut

2021 ◽  
pp. 1448-1462
Author(s):  
Bhushan B. Wagh ◽  
Sachin H. Ugale ◽  
Shivanand K. Vishwakarma ◽  
Tushar T. Kapade
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Heat Exchangers ◽  
Cfd Simulation ◽  
Swirling Flow ◽  
Research Work ◽  
Twisted Tape ◽  
Cross Sectional ◽  
Tube Heat Exchanger ◽  
Icem Cfd

Numerical investigations of heat transfer and friction factor characteristics in swirling flow conditions using CFD simulation. A commercial CFD package, Ansys R1 2021, was used in this study. 3D models for circular tube fitted with Square-cut twisted tape (QCT) inserts with two pitch 100mm, 50 mm and different cut depths (d = 4 mm, 5mm and 7 mm) were generated for the simulation. Insertion of twisted tapes into the tubes of the heat exchangers is important for enhancement of heat transfer to increase the performance of heat exchangers. In the present Research work, computational analysis has been carried out to analyse the enhancement of rate of heat transfer using Square cut cross sectional twisted tape inserts in a pipe heat exchanger. Geometrical model of heat exchanger has been generated and computational mesh is created using ICEM CFD, an advanced meshing software. The analysis has been carried out for plain tube and with Square cut cross sectional twisted tape inserts with different twist ratio analyse the temperature distribution, velocity distribution and pressure distribution along the tubes and shell using ICEM CFD.

Sign in / Sign up

Export Citation Format

Share Document