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Thermal analysis of v-cut twisted tape fitted heat exchanger: A numerical approach

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Abstract

In this study, an investigation of the impact of use of plain twisted tape and a V-cut twisted tape in tube on heat transfer rate and pressure drop is done. To generate the vortex flow in the fluid domain the use of twisted tape is more effective. The flow analysis done by using numerical technique. Subsequently, the thermal performance characteristics of these configurations were examined. The analysis has been performed on three-dimensional incompressible flow. The study uses the k-ω (SST) turbulence model. A v-cut twisted tape is axially inserted and immersed in the tube. Laminar to turbulent is the range. Laminar to turbulent flow is first explored in plain tube. Results were validated by comparing pre-existing associations. Compared to the plain design, the v-cut design increases heat rate significantly. Wider cuts generate more recirculation flow in addition to vortex flow. Heat increases as twist ratio lowers. The heat transfer rate at lower twist ratio of 2 is greater than that at higher twist ratios of 3, 5, and 7 for all Reynolds numbers. A twisted tape with V-cut creates vortex flow, which, along with secondary flow through the cuts, increases turbulence. Enhanced turbulence mixes fluid layers between the pipe’s inner lining and fluid core.

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Abbreviations

Nu:

Nusselt number

\({N}_{{u}_{local}}\) :

Local Nusselt number

Nu p :

Nusselt number from plain tube

h local :

Local convective heat transfer coefficient

Re:

Reynolds number (= ρVd /µ)

V:

Velocity (m/s)

D h :

Hydraulic Diameter (mm)

A:

Heat transfer surface area (mm2)

t:

Thickness of twisted tape (mm)

W:

Width of twisted tape (mm)

p:

Pitch of twisted tape (mm)

d:

Depth of v-cut on twisted tape (mm)

w:

Width of v-cut on twisted tape (mm)

TR:

Twist ratio (pitch/width of twisted tape, p/W)

E :

Total Energy

Two:

Temperature of water flowing through the tube

Smx :

Source Term of mass along x-Direction

Smy :

Source Term of mass along y-Direction

Smz :

Source Term of mass along z-Direction

div :

Divergence

k eff :

Effective thermal conductivity

s h :

Source term Enthalpy

C 1 :

Model Constant

S :

Rate of Strain Tensor

C 2 :

Model Constant

C 3ε :

Model Constant

S ε :

Source Term Viscous dissipation

C μ :

Model Constant

\(\frac{\partial \rho }{\partial t}\) :

Time rate change of density

ρu,ρv,ρw :

Mass flow

Greek Symbols :

-

μ t :

Turbulent viscosity (Ns/m2)

ε:

Dissipation rate

\(\vartheta\) :

Fluid kinematic viscosity

\(\vartheta \epsilon\) :

Fluid kinematic viscosity

t :

Time

u :

x component of velocity

u:

Velocity vector

λ :

Wave length of the thin liquid sheet

k :

Thermal Conductivity

(τij)eff :

Deviatoric stress tensor

η :

Thermal performance factor

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Authors and Affiliations

  1. Mechwell Industries Limited, MIDC Shinde, Naigaon Road, Sinnar, Nashik, Maharashtra, India

    Tushar T. Kapade, Sanjay K. Shah, Dhruvian S. Shah & N. Suresh Kumar

  2. Hi-Tech Institute of Technology, MIDC Waluj, Bajajnagar, Aurangabad, Maharashtra, India

    Janardhan K. Bhor

  3. Dr. D. Y. Patil Institute of Technology, Pimpri, Pune, Maharashtra, India

    Vikas S. Panwar

  4. Centre of Research Impact and Outreach, Chitkara University, Rajpura, Punjab, India

    Gurbhej Singh

  5. Department of Mechanical Engineering, Amritsar Group of Colleges, Amritsar, Punjab, India

    Gurbhej Singh

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  1. Tushar T. Kapade
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Correspondence to Vikas S. Panwar.

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Kapade, T.T., Shah, S.K., Shah, D.S. et al. Thermal analysis of v-cut twisted tape fitted heat exchanger: A numerical approach. Int J Interact Des Manuf (2024). https://doi.org/10.1007/s12008-024-01883-2

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