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Experimental Investigation on Heat Transfer Enhancement from a Channel Mounted with Staggered Blocks

  • Research Article - Mechanical Engineering
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Abstract

The present work experimentally investigates heat transfer enhancement from a channel mounted with staggered blocks. The effect of the geometrical parameters, such as the square and circular shapes of the blocks and the ratio of the centre to centre spacing between the blocks (L x /L y ratio) along the stream-wise direction and transverse direction of flow, has been investigated. Experiments were conducted using the newly developed experimental setup for Reynolds number ranging from 100 to 500 based on the hydraulic diameter and the average velocity of flow through the channel. The heat input values varied from 100 to 300 W with a step of 50 W, and water was used as working fluid. The results suggest that the variation of the Reynolds number significantly influenced the heat transfer enhancement compared with other geometrical parameters. The square- shaped block imposed greater impact on the heat transfer than the circular blocks. An increase in the heat transfer was observed while increasing the L x /L y ratios from 1.5 to 2.5 for the square blocks, whereas it was reduced for the circular blocks.

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Abbreviations

A t :

Total surface area (m 2)

BR :

Blockage ratio

D h :

Hydraulic diameter (m)

Gr :

Grashof number

H :

Height of the channel (mm)

I :

Current supplied to heater (Ampere)

h :

Heat transfer coefficient (Wm–2 K–1)

k :

Thermal conductivity of water (Wm–1 K–1)

L :

Length of the test section (mm)

L c :

Length of the channel (mm)

L x :

Stream-wise direction centre to centre distance between blocks (cm)

L y :

Transverse direction centre to centre distance between blocks (cm)

\({\dot{m}}\) :

Mass flow rate in kgs–1

Nu :

Nusselt number

Q :

Heat supplied to the heater (Watt)

Q t :

Total heat supplied to the test section (Watt)

Ra :

Average roughness value (\({\times10^{-6}\,{m}}\))

Re :

Reynolds number

T :

Temperature (°C)

V :

Voltage input to the heater (Volt)

W :

Width of the test section (mm)

w :

Width of the channel (mm)

μ :

Fluid dynamic viscosity of water (kg/ms)

axi:

Axial

cond:

Conduction

f:

Film

in:

Inlet

out:

Outlet

rad:

Radiation

s:

Surface

t:

Total

x, y :

Stream-wise and transverse direction respectively, Fig. 3a

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Authors and Affiliations

  1. Department of Mechanical Engineering, Kalasalingam University, Krishnankoil, Virudhunagar, 626126, Tamilnadu, India

    M. Sivasubramanian, M. Uthayakumar & P. Ganesan

  2. Department of Mechanical Engineering, Velammal College of Engineering and Technology, Madurai, 625009, Tamilnadu, India

    P. Rajesh Kanna

Authors
  1. M. Sivasubramanian
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  2. P. Rajesh Kanna
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  3. M. Uthayakumar
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  4. P. Ganesan
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Correspondence to M. Sivasubramanian.

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Sivasubramanian, M., Rajesh Kanna, P., Uthayakumar, M. et al. Experimental Investigation on Heat Transfer Enhancement from a Channel Mounted with Staggered Blocks. Arab J Sci Eng 40, 1123–1139 (2015). https://doi.org/10.1007/s13369-015-1570-8

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  • DOI: https://doi.org/10.1007/s13369-015-1570-8

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