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CFD analysis of constant wall-temperature with different materials bayonet tubes in variable flow region

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Abstract

The CFD analysis was conducted using Ansys 19.0 for bayonet tubes with different construction materials and constant wall temperatures. It was used to determine what Reynolds number and material would be suitable for use in a parabolic solar water heater and heat exchanger. The results of the analysis showed that cold water flows along a central tube and exits through an annular portion, and five different materials were used to construct the interior of the bayonet tube. The Reynolds number is used to calculate short circuit and total heat transmission, Nusselt number, friction factor, and effectiveness. Heat transmission from short circuits increases with increased thermal conductivity, causing effectiveness to decrease with corresponding Reynolds numbers. Optimal results are obtained when CPVC is used as the inner part of the tube, with the highest efficiency for bayonet solar collectors reaching 0.89 at a Reynolds number of 75 and the minimum efficiency using an inner CPVC tube being 0.26. These results provide valuable reference points for engineers and designers when designing parabolic solar collectors and heat exchangers that utilize bayonet tubes.

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Data availability

The data that support the findings of this research are available upon request from the corresponding author. Due to the sensitive nature of the data and to ensure the privacy and confidentiality of the participants, access to the data will be granted after a formal request and with the approval of the appropriate ethical review board. Requests for data should be addressed to [Nishant Singh and email: kaalkhanday@gmail.com].

Abbreviations

A :

Surface area of the tube (m2)

ρ :

Density (kg m−3)

d :

Diameter (m)

L c :

Clearance length of the bayonet tube (m)

T :

Temperature (K)

L :

Length of the bayonet tube (m)

ṁ :

Mass flow rate of the flowing fluid (kg s−1)

v :

Average velocity of fluid (m s−1)

T w :

Wall temperature of tube (K)

τ :

Shear stress (Pa)

u :

Initial velocity of fluid (m s−1)

k :

Thermal conductivity (W m−1 K−1)

c p :

Specific heat capacity (KJ kg−1 K−1)

Nuo :

Overall Nusselt number

μ :

Dynamic viscosity (Pa s)

ε :

Effectiveness of the bayonet tube

P :

Pressure (Pa)

Q T :

Rate of total heat transmission (W)

F :

Friction factor

Re:

Reynolds number

Q S :

Rate of short circuit heat transmission (W)

w :

Water

m :

Mean

1 :

Inner tube (CPVC, PVC, GI, Cu, Al)

i :

Inner surface/inlet

o :

Outer surface/outlet

f :

Fluid

2:

Outer or annulus tube (GI tube)

h :

Hydraulic

r :

Radial component

z :

Axial component

∆ :

Difference

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Authors and Affiliations

  1. Department of Mechanical Engineering, National Institute of Technology, Jamshedpur, 831014, India

    Nishant Singh, Ram Vinoy Sharma & Shalendra Kumar

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  1. Nishant Singh
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  2. Ram Vinoy Sharma
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  3. Shalendra Kumar
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Contributions

NS, who also wrote the manuscript, developed the simulation work on the bayonet tube. RVS acted as a research mentor, reviewing the paper and data analysis, while SK meticulously scrutinized the manuscript.

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Correspondence to Nishant Singh.

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Singh, N., Sharma, R.V. & Kumar, S. CFD analysis of constant wall-temperature with different materials bayonet tubes in variable flow region. Multiscale and Multidiscip. Model. Exp. and Des. 6, 537–551 (2023). https://doi.org/10.1007/s41939-023-00161-0

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