Determination of Optimum Concentration of Nanofluid for Process Intensification of Heat Transfer Using Corrugated Plate Type Heat Exchanger
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Vijaya Kumar Talari
und
R. C. Sastry
Abstract
In this study cooling of hot water is taken up using a compact heat exchanger such as corrugated plate type heat exchanger and with utility fluid as a nanofluid prepared from mixing Al2O3 in water. In general a monotonic increase of 30 % to 70 % in overall heat transfer coefficient is observed for increase in nanofluid concentration as well as its flow rate. An optimum concentration of nanofluid is hence not possible to be found as heat transfer coefficient exhibited a monotonic trend. But there is a penalty for using nanofluid of higher concentrations in heat exchangers in the form of additional hydraulic power required to supply the nanofluid due its higher viscosity. Hence, as a novel approach, a target temperature drop of 15 °C for hot fluid (with constant flow rate) is assumed and the minimum critical flow rate of cold nanofluid of various concentrations required for achieving this is determined using simulation. For such a critical flow rate at various nanofluid concentrations, the determined hydraulic power (product of pressure drop and flow rate) exhibited a global minimum around 0.75 % volume concentration of Al2O3 in water. Thus this article presents the process intensification procedure for the heat exchangers using nanofluids as heat transfer enhancement option.
Nomenclature
- A
Area of plate (m2)
Coefficient of specific heat capacity (J/(kg-K))
- hc
Film heat transfer coefficient at cold fluid side (W/(m2-K))
- hh
Film heat transfer coefficient at hot fluid side (W/(m2-K))
- k
Thermal Conductivity (W/(m-K)).
- LPM
Liters per minute.
Mass flow rate (kg/s).
Mass of basefluid/water (kg)
Mass of nanoparticles (kg)
- P
Pressure (Pa)
- Q
Total heat transfer rate (W)
- Qcold
Cold fluid flow rate (LPM)
- qw
Normal heat flux at wall/plate (W/m2)
- T
Temperature (°C).
- Uo
Overall heat transfer coefficient (W/(m2-K)).
Velocity field (m/s)
- x
x-coordinate
- y
y-coordinate
- ΔTcold, nanofluid
Temperature gained by cold nanofluid (°C)
- ΔThot
Temperature drop in hot fluid (°C)
- ΔT1
Temperature difference at left side (°C)
- ΔT2
Temperature difference at right side (°C)
Logarthim mean temperature difference (°C)
- Greek Letters
Volume fraction of nanoparticles.
Nanoparticle density (kg/m3)
Basefluid density (kg/m3)
Density of nanofluid (kg/m3)
Density of basefluid (kg/m3)
- µ
Viscosity (Pa.s)
- Subscript
- p
Particle
- nf
nanofluid
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Artikel in diesem Heft
- Research Articles
- Effect of Pin-Fin Geometry on Microchannel Performance
- Study of Process Factor Effects and Interactions in Synthesis Gas Production via a Simulated Model for Glycerol Steam Reforming
- Robust Prediction of Filtrate Flux for Separation of Catalyst Particles from Wax Effluent of Fischer-Tropsch Bubble Column Reactor via Regularization Network
- Modelling and Simulation of Multiphase Flow Applicable to Processes in Oil and Gas Industry
- CH4 Direct Reduction of In-Flight Fe3O4 Concentrate Particles
- Determination of Optimum Concentration of Nanofluid for Process Intensification of Heat Transfer Using Corrugated Plate Type Heat Exchanger
- Investigating Three Different Models for Simulation of the Thermal Stage of an Industrial Split-Flow SRU Based on Equilibrium-Kinetic Approach with Heat Loss
- Analytical Design of Enhanced Fractional Filter PID Controller for Improved Disturbance Rejection of Second Order Plus Time Delay Processes
Artikel in diesem Heft
- Research Articles
- Effect of Pin-Fin Geometry on Microchannel Performance
- Study of Process Factor Effects and Interactions in Synthesis Gas Production via a Simulated Model for Glycerol Steam Reforming
- Robust Prediction of Filtrate Flux for Separation of Catalyst Particles from Wax Effluent of Fischer-Tropsch Bubble Column Reactor via Regularization Network
- Modelling and Simulation of Multiphase Flow Applicable to Processes in Oil and Gas Industry
- CH4 Direct Reduction of In-Flight Fe3O4 Concentrate Particles
- Determination of Optimum Concentration of Nanofluid for Process Intensification of Heat Transfer Using Corrugated Plate Type Heat Exchanger
- Investigating Three Different Models for Simulation of the Thermal Stage of an Industrial Split-Flow SRU Based on Equilibrium-Kinetic Approach with Heat Loss
- Analytical Design of Enhanced Fractional Filter PID Controller for Improved Disturbance Rejection of Second Order Plus Time Delay Processes
