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Impact of cut diameter on thermohydraulic performance of DPHE: an experimental analysis using internet of things (IoT) approach

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Abstract

In this experimental study, we aimed to determine the combined effect of circular and semicircular cuts on twisted tape inserts in a double pipe heat exchanger operating in a turbulent regime with a Reynolds number ranging from 4000 to 18000. The insert used had circular cuts on the neutral axis and semicircular cuts on the edges. The diameter of the cuts was varied between 4 mm, 6 mm, and 8 mm for twisted tapes with twist ratios (x/b) of 4.5, 5.5, and 6.5. To reduce errors and increase automation, we employed the internet of things approach to measure additional input and output parameters, as well as cold and hot flow rates. This approach yielded more reliable results by minimizing human intervention. The findings of the present study indicate that the definite modifications in twisted tape led to a significant improvement in thermohydraulic performance metrics. Compared to other types of cuts, the circular and semicircular cut twisted tapes with x/b = 4.5 and φ = 8 mm achieved the most competitive enhancement in thermohydraulic properties.

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Data availability

Data will be available on request.

Abbreviations

Q:

Heat Transfer Rate, W

Cp :

Specific heat capacity at constant pressure, J/kg-K

m:

Mass flow rate, kg/s

A:

Cross sectional area of tube, m2

y:

Twist ratio

f :

Friction factor

Nu:

Nusselt Number

Dh :

Hydraulic diameter of annulus, m

Re:

Reynolds Number

V, u:

Velocity (m/s)

h:

Convective heat transfer coefficient, W/m2-K

dh :

Hydraulic diameter of tube, m

L:

Length of tube

D:

Annulus diameter, m

k:

Thermal conductivity W/mK

Pr:

Prandtl Number

U:

Overall heat transfer coefficient, W/m2-K

T:

Temperature

ϑ :

Kinematic viscosity m2/s

φ :

Hole diameter, m

ρ :

Density kg/m3

η :

TPF

c:

Cold

o:

Out

s:

Surface Area

b:

Bulk mean

cross:

Cross sectional

DPHE:

Double pipe heat exchanger

CWC:

Centre wing cut

PEC:

Performance evaluation criterion

PT:

Perforated tape

∆P :

Differential pressure

PTT:

Plain twisted tape

CSCTT:

Circular and semi-circular cut twisted tape

CC:

Cross cut

TPF:

Thermal performance factor

WC:

Wing cut

CSC:

Centre square cut

TC:

Trapezoidal cut

SC:

Square cut

PC:

Peripherally cut

WN:

Wire Nails

RC:

Rectangular cut

VC:

V-cut

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Acknowledgements

The research work conducted received support from the Department of Mechanical Engineering at MANIT, Bhopal in association with MoE, Government of India.

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  1. Department of Mechanical Engineering, MANIT, Bhopal, India

    Manoj Kumar Diwaker & Arvind Kumar

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  1. Manoj Kumar Diwaker
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Correspondence to Manoj Kumar Diwaker.

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Diwaker, M.K., Kumar, A. Impact of cut diameter on thermohydraulic performance of DPHE: an experimental analysis using internet of things (IoT) approach. Heat Mass Transfer 59, 2299–2310 (2023). https://doi.org/10.1007/s00231-023-03418-z

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