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Effect of Wall Proximity on the Flow Over a Heated Square Bluff Body

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Fluid Mechanics and Fluid Power – Contemporary Research

Part of the book series: Lecture Notes in Mechanical Engineering ((LNME))

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Abstract

The two-dimensional numerical simulations of Newtonian fluid stream about a square bluff body have been studied in an unconfined configuration in addition in the propinquity of a plane wall. The comparison of flow and heat transfer constraints is done with the pure unconfined flow about a square obstacle. The set of physical constraints considered as Reynolds numbers (Re) = 100, 120 and Prandtl number (Pr) = 0.7 (air) at varying values of gap ratios (g). The values of drag and lift coefficients, and average Nusselt number are computed. The present study shows that on increasing the gap ratio, the drag coefficient is acquired to be the highest for the gap ratio of unity and it is observed the lowest for the unconfined case. Lift coefficient decreases and average Nusselt number increases with increasing gap ratio, but opposite effects are observed for the unconfined case. The flow becomes steady at low gap ratio, but on increasing gap ratio the flow behavior changes to periodic unsteady. The augmentation in heat transfer is found about 35 % for g = 1, with respect to the corresponding value for the unconfined case.

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Abbreviations

Cp :

Specific heat capacity, J kg−1 K−1

CD :

Drag coefficient

CL :

Lift coefficient

D :

Side of a square cylinder, m

f :

Vortex shedding frequency, s−1

g :

Ratio of gap (g */D)

H :

Height of the domain, m

k :

Thermal conductivity, Wm−1K−1

L u :

Upstream distance, m

L d :

Downstream distance, m

Nu:

Average Nusselt number

p :

Pressure

Pr:

Prandtl number (µCP/k)

Re:

Reynolds number (UDρ/µ)

St :

Strouhal number (fD/U)

t :

Time

U :

Average inlet velocity, m s−1

u,v :

x and y-components of velocity

x,y :

Stream wise and transverse co-ordinates

*:

Dimensional value

μ:

Viscosity of the fluid, kg m−1 s−1

θ :

Temperature

ρ :

Density of the fluid, kg m−3

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Author information

Authors and Affiliations

  1. Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, 247 667, Uttarakhand, India

    Deepak Kumar &  Amit Dhiman

Authors
  1. Deepak Kumar
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  2. Amit Dhiman
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Corresponding author

Correspondence to Amit Dhiman .

Editor information

Editors and Affiliations

  1. Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh, India

    Arun K. Saha

  2. Department of Aerospace Engineering, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh, India

    Debopam Das

  3. Department of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh, India

    Rajesh Srivastava

  4. Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh, India

    P. K. Panigrahi

  5. Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh, India

    K. Muralidhar

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Deepak Kumar, Amit Dhiman (2017). Effect of Wall Proximity on the Flow Over a Heated Square Bluff Body. In: Saha, A., Das, D., Srivastava, R., Panigrahi, P., Muralidhar, K. (eds) Fluid Mechanics and Fluid Power – Contemporary Research. Lecture Notes in Mechanical Engineering. Springer, New Delhi. https://doi.org/10.1007/978-81-322-2743-4_26

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  • DOI: https://doi.org/10.1007/978-81-322-2743-4_26

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  • Publisher Name: Springer, New Delhi

  • Print ISBN: 978-81-322-2741-0

  • Online ISBN: 978-81-322-2743-4

  • eBook Packages: EngineeringEngineering (R0)

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