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CFD analysis for thermo-hydraulic properties in a tubular heat exchanger using curved circular rings

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Abstract

The never-ending demands of humans have led researchers to find more efficient energy conversion technologies. Enhancing heat transfer rate in a tubular heat exchanger through curved circular rings is one type of passive method that is studied in this work. The computational analysis has been done using “FLUENT” module of ANSYS 16.0. The tubular heat exchanger has internal diameter of 68.1 mm, length of 1.5 m and constant heat flux of 1000 W m−2. Air is the working fluid, which flows in Re varying from 3000 to 21,000. After reaching steady state conditions, the Nusselt number and friction factor are calculated for CCR rings. Furthermore, perforation has been done on these rings with perforation index 8, 12 and 16% and thermo-hydraulic properties are investigated. Computational results show that perforating the rings have a significant effect on heat transfer and friction factor. Greater the perforation index, greater is the Nu and TPF. The maximum enhancements obtained in Nu and TPF are 7.4 and 1.56 times, respectively (as compared to that of smooth tube), for PCCR-16%.

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Abbreviations

Re:

Reynolds number

v :

Velocity of air (ms−1)

D :

Test section diameter (m)

D 1 :

Internal diameter of insert (m)

Nu:

Nusselt number

Nus :

Nusselt number for smooth tube

h :

Average convective heat transfer coefficient (W m−2 K−1)

k :

Thermal conductivity of air (W m−1 k−1)

Pr:

Prandtl number

m :

Air flow rate (kg s−1)

ΔP :

Pressure difference between inlet and outlet of the test section (Pa)

T i :

Inlet air temperature (K)

T o :

Outlet air temperature (K)

T wm :

Wall mean temperature (K)

T fm :

Fluid mean temperature (K)

Q :

Heat flux (W)

Q air :

Heat carried by air (W)

Q conv :

Heat transfer by convection (W)

C p :

Specific heat of air (J kg−1 K−1)

A :

Area of the pipe (m2)

f :

Friction factor

f s :

Friction factor for smooth tube

L :

Test section length (m)

l :

Distance between two consecutive inserts (m)

P A :

Perforated area of insert (m2)

T A :

Total area of insert (m2)

TPF:

Thermal performance factor

CCR:

Curved circular rings

PCCR:

Perforated curved circular rings

PI:

Perforation index (PA/TA)

ANN:

Artificial neural network

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Authors and Affiliations

  1. Department of Mechanical Engineering, B.T. Kumaon Institute of Technology, Dwarahat, 263653, Uttarakhand, India

    Satyendra Singh, Himanshi Kharkwal & Ashutosh Pandey

  2. Alternate Hydro Energy Centre, IIT Roorkee, Roorkee, 247667, India

    Abhishek Gautam

Authors
  1. Satyendra Singh
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  2. Himanshi Kharkwal
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  3. Abhishek Gautam
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  4. Ashutosh Pandey
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Correspondence to Satyendra Singh.

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Singh, S., Kharkwal, H., Gautam, A. et al. CFD analysis for thermo-hydraulic properties in a tubular heat exchanger using curved circular rings. J Therm Anal Calorim 141, 2211–2218 (2020). https://doi.org/10.1007/s10973-020-09670-3

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  • DOI: https://doi.org/10.1007/s10973-020-09670-3

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