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Thermal performance and frictional losses study of solid hollow circular disc with rectangular wings in circular tube

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Abstract

In this research the thermal properties for solid hollow circular disc with rectangular wings in circular pipe heat exchanger tube are analysed. Taking constant heat flux and steady state conditions, the investigation of the heat transfer, friction factor and thermal performance of the tube is done. The different parameters diameter ratio (DR = 0.8 and 0.9), blockage ratio (BR = 0.1 and 0.05), pitch ratio (PR = 2 and 3) and wings attack angle (θ = 15° and 30°) on heat transfer coefficient have been considered for the research. The working fluid is air at Reynolds number varying from 7000 to 32,000. Experimental results shows that heat transfer was improved 3.47 times for case DR = 0.8, BR = 0.1, PR = 2 and θ = 15° over plain tube. The highest thermal performance factor found is 1.95 at DR = 0.9, BR = 0.05, PR = 3, θ = 15°.

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Abbreviations

A :

Heat transfer surface area, (m2)

BR :

Blockage ratio (H/D)

C p,air :

Specific heat capacity of hot air, (jkg−1 K−1)

D :

Diameter of test tube, (m)

D i :

Internal daimeter of insert, (m)

DR :

Diameter ratio (Di/D)

f :

Friction factor

f s :

Friction factor of smooth tube

h :

Convective heat transfer coefficient, (W m−2 K−1)

H :

Height of wing, (m)

I :

Current, (A)

k :

Thermal conductivity of air, (Wm−1 k−1)

l :

Length of Rectangular wing, (m)

L :

Length of test section, (m)

ṁ :

Mass flow rate, (kgs−1)

Nu :

Nusselt number

Nu s :

Nusselt number for smooth tube

P :

Spacing between two consecutive inserts, (m)

ΔP :

Pressure drop, (Pa)

Pr :

Prandtl number

PR :

Pitch ratio (P/D)

Q :

Heat transfer rate, (W)

Re :

Reynolds number.

T wm :

Wall mean temperature, (K)

T fm :

Fluid mean temperature

T i :

Inlet temperature, (K)

T o :

Outlet temperature, (K)

v:

Mean velocity of fluid (m/s)

V:

Voltage, (V)

η/(tpf):

Thermal performance factor

μ:

Dynamic viscosity, (Nsm−2)

ν:

Kinematic viscosity, (m2 s−1)

α :

Wings attack angle

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Authors and Affiliations

  1. Department of Mechanical Engineering, Bipin Tripathi Kumaon Institute of Technology, Dwarahat, Uttarakhand, India

    Satyendra Singh, Jagmohan Singh Negi, Sangeeta Bisht & Himanshu Sah

Authors
  1. Satyendra Singh
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  2. Jagmohan Singh Negi
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  3. Sangeeta Bisht
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  4. Himanshu Sah
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Correspondence to Satyendra Singh.

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Singh, S., Negi, J.S., Bisht, S. et al. Thermal performance and frictional losses study of solid hollow circular disc with rectangular wings in circular tube. Heat Mass Transfer 55, 2975–2986 (2019). https://doi.org/10.1007/s00231-019-02631-z

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