PRESENTED BY M. RAJAMOHANPh.D (PART TIME)REG.NO: 1412219864UNDER THE GUIDANCE OF

Dr. G. KUMARESANAAINSTITUTE FOR ENERGY STUDIES,DEPARTMENT OF MECH. ENGG.COLLEGE OF ENGINEERINGANNAUNIVERSITYCHENNAI-600 025EXPERIMENTAL INVESTIGATION ON HEAT TRANSFER AND FRICTION FACTOR CHARACTERISTICS OF DIFFERENT NANO FLUIDS UNDER LAMINAR & TURBULENT FLOW WITH PERFORATED TWISTED TAPE INSERTS*

*INTRODUCTIONLITERATURE REVIEWRESEARCH GAP OBJECTIVE OF THE PROPOSED RESEARCH METHODOLOGY LAYOUT CONCLUSIONS REFERENCES

*Heat transfer enhancement techniques are widely utilized in many applications in the heating process to enable reduction in weight and size or increase the performance of heat exchangers.

These techniques are classified as active and passive techniques. The active technique required external power such as surface vibration, electric or acoustic fields.

Whereas the passive techniques required fluid additives, special surface geometries or swirl/vortex flow devices i.e.; Twisted tape inserts.

Moreover the passive techniques can play an important role in the heat transfer augmentation if a proper configuration of the insert is being selected based on working conditions.

New Technologies and new advanced fluids with potential to improve flow & thermal characteristics are of critical importance. In recent years, Nanofluids are promising fluids to meet and enhance the challenges.

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YearAuthorsJournal ParticularsInference2014 Waghole et.alEnergy ProcediaVolume 45, 2014, Pages 558567Heat Transfer and friction factor data at various volume concentrations for flow in absorber/Receiver and with and without twisted tape inserts is determined experimentally (with water and silver Nanofluid). The experiments show that Nussult Number, friction factor and enhancement efficiency are found to be 1.25 -2.10 times, 1.0 -1.75 times and 135%-205%, respectively. 2014Bhuiya et.alInternational Communications in Heat and Mass TransferVolume 50, Pages 2533The experiments were performed with double counter twisted tapes of four different twist ratios (y=1.95, 3.85, 5.92 and 7.75) using air as the testing fluid in a circular tube turbulent flow regime. The experimental results demonstrated that the Nusselt number, friction factor and thermal enhancement efficiency were increased with decreasing twist ratio. 2014Nanan et. alInternational Communications in Heat and Mass Transfer

Volume 50, Pages 106112Influence of perforated helical twisted-tapes (P-HTTs) on the heat transfer, friction loss and thermal performance characteristics under a uniform heat flux condition is reported. The experimental results reveal that the use of P-HTTs leads to the reduction of friction loss as compare to that of HTT. Heat transfer, friction loss and thermal performance factor increase as d/w decreases and s/w increases.

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YearAuthorsJournal ParticularsInference2014 Reddy et.al International Communications in Heat and Mass Transfer

Volume 52, Pages 68-76.Heat transfer coefficient and friction factor of TiO2 nanofluid flowing in a double pipe heat exchanger with and without helical coil inserts are studied experimentally. The heat transfer coefficient and friction factor get enhanced by 10.73% and 8.73% for 0.02% volume concentration of nanofluid when compared to base fluid flowing in a tube. 2013Bhuiya et.al International Communications in Heat and Mass Transfer

Volume 46, Pages 59-67.This work deals with the experimental investigation on Nusselt number, friction factor and thermal performance factor in a circular tube equipped with perforated twisted tape inserts with four different porosities of Rp=1.6, 4.5, 8.9 and 14.7%. The experimental results revealed that both heat transfer rate and friction factor of the tube fitted with perforated twisted tapes were significantly higher than those of the plain tube. 2013Mogaii et.alInternational Journal of RefrigerationVolume 36, Pages 504515This study presents experimental results of heat transfer coefficient and pressure drop during two-phase flow of R134a in a horizontal tube containing twisted-tape inserts. Experimental pressure drop and heat transfer coefficient results are presented, and also an analysis of overall enhancement due to the inserts. The use of twisted-tape inserts is suitable if applied to the high vapor quality region of the evaporator and under high mass velocities.

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YearAuthorsJournal ParticularsInference2013Song et.al Procedia EngineeringVolume 56, Pages 96103 An experimental investigation was carried for measuring tube-side heat transfer coefficient, friction factor, heat transfer enhancement efficiency of water for turbulent flow in a circular tube fitted with rectangular-cut twisted tape insert. Heat transfer enhancement efficiencies were found to be in the range of 1.9 to 2.3 and increased with the increase of Reynolds number.

2012Suresh et.al Chemical Engineering and ProcessingVolume 53 Pages 24 30 An experimental investigation on the convective heat transfer and friction factor characteristics in circular tube with spiraled rod inserts (pitch = 15 mm, 30 mm) under turbulent flow with constant heat flux is carried out with distilled water and Al2O3/water nanofluids. It is found that heat transfer enhancement is caused by suspending nanoparticles and becomes more pronounced with the increase of the particle volume concentration.2012Suresh et.al Experimental Thermal and Fluid Science Volume 35 542549An experimental investigation on the convective heat transfer and friction factor characteristics in the plain and helically dimpled tube under turbulent flow with constant heat flux is presented in this work using CuO/water nanofluid as working fluid.. The experimental results of isothermal pressure drop for turbulent flow showed that the dimpled tube friction factors were about 210% higher than the plain tube.

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Thank you *

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