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Computational parametric investigation of solar air heater with dimple roughness in S-shaped pattern

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Abstract

A numerical investigation has been conducted to analyze the hydro-thermal characteristics of a solar air heaters when its absorber plate has S-shaped pattern dimple roughness. This analysis is conducted for appropriate levels of geometric constraints, such as relative roughness pitch and dimple diameter. Using commercial code ANSYS Fluent, various solar air heater configurations were simulated for Reynold number ranging from 4000 to 20,000. The present simulation model has been validated with Dittus–Boelter equation and are found to be in good agreement with it. It was found that S-shaped dimple roughness has yielded 2.45–3.55 times higher Nusselt number value and having 2.81–4.54 times larger friction factor compared to smooth solar air heater. It was observed that as dimple diameter increases, the Nusselt number increases but upto 2.8 mm and afterwards it decreases. Similar trend is also observed for relative pitch roughness, where it increases upto 10 and starts declining afterwards. Furthermore, the optimum solar air heater configuration has also been identified in terms of Nusselt number and friction factor. Among all configurations, maximum thermo hydraulic performance value of 2.15 was obtained for dimple diameter of 2.8 mm and relative pitch roughness of 10 at Reynold number of 20,000.

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Abbreviations

A:

Heat transfer area

\({{\varvec{C}}}_{{\varvec{p}}}\) :

Heat capacity (J/Kg K)

\({\varvec{d}}\) :

Dimple diameter (mm)

Dh :

Hydraulic diameter

e:

Roughness height (mm)

f:

Friction factor

g:

Gap between roughness (mm)

H:

Channel height (mm)

I:

Insolation (W/m2)

k:

Thermal conductivity (W/mK)

L:

Channel length (mm)

L1 :

Channel entrance length (mm)

L2 :

Channel test length (mm)

L3 :

Channel exit length (mm)

Nu:

Nusselt number

p:

Pitch (mm)

Δp:

Pressure drop (Pa)

Re:

Reynold number

Pr:

Prandtl number

T:

Temperature (K)

u:

Air flow velocity in x-direction (m/s)

v:

Air flow velocity in y-direction (m/s)

w:

Air flow velocity in z-direction (m/s)

W:

Channel width (mm)

ρ:

Density (Kg/m3)

µ:

Dynamic viscosity (Ns/m2)

\(\lambda\) :

Thermal diffusivity (m2/s)

\(v\) :

Kinematic viscosity (m2/s)

r:

Roughened solar air heater

s:

Smooth solar air heater

in:

Inlet

Out:

Outlet

SAH:

Solar air heater

SST:

Shear stress transport

CFD:

Computational fluid dynamics

THP:

Thermo hydraulic performance

RNG:

Renormalization group

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Authors and Affiliations

  1. Department of Thermal Engineering, Faculty of Technology, Veer Madho Singh Bhandari Uttarakhand Technical University, Dehradun, 248007, India

    Jagjeet Singh & Vijay Singh Bisht

  2. Department of Mechanical Engineering, K R Mangalam University, Sohna, India

    Prabhakar Bhandari & Kaushal Kumar

  3. Department of Mechanical Engineering, UCRD Chandigarh University, Chandigarh, India

    Jarnail Singh

  4. CSIR—Central Building Research Institute, Roorkee, 247667, India

    Tabish Alam

  5. Department of Industrial and Systems Engineering, Khalifa University, 127788, Abu Dhabi, United Arab Emirates

    Saurav Dixit

  6. Division of Research and Innovation, Uttaranchal University, Premnagar, Dehradun, 248007, Uttarakhand, India

    Saurav Dixit

  7. Lovely Professional University, Ludhiyana, India

    Subhav Singh

  8. Department of Management and Innovation, National Research University “Moscow State University of Civil Engineering”, Moscow, Russia

    Rinat Khusnutdinov

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  1. Jagjeet Singh
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Singh, J., Bisht, V.S., Bhandari, P. et al. Computational parametric investigation of solar air heater with dimple roughness in S-shaped pattern. Int J Interact Des Manuf (2023). https://doi.org/10.1007/s12008-023-01392-8

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