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Heat transfer augmentation in double pipe heat exchanger using mechanical turbulators

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Abstract

The work presented here focuses on heat transfer augmentation by means of divergent-convergent spring turbulator (the enhancement device). Aim of the present work is to find such an optimum pitch at which the augmentation in heat transfer is maximum and the amount of power consumption is minimum, so that an economic design can be created with maximum thermal efficiency. So, the concept of pitch variation is introduced, which is defined as the horizontal distance between two consecutive turbulators. It describes that, the lesser is the pitch the more number of turbulators that can be inserted in inner pipe of double pipe heat exchanger, hence more will be the friction factor. This physics increases convective ability of the heat transfer process from the surface of inner pipe. There is a certain limit to which a pitch can be decreased, lesser the pitch the more the pressure drop and friction factor and hence the more will be the pumping power requirement to maintain a desired mass flow rate of hot water. Analysis of thermal factors such as Nusselts number, friction factor, with different pitches of divergent convergent spring turbulators of circular cross-section 15, 10, and 5 cm at Reynolds’s number ranging between 9000 < Re < 40,000 is done graphically.

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Abbreviations

D:

Pipe diameter

g:

Acceleration due to gravity

h:

Heat transfer coefficient

hf :

Head loss

K:

Thermal conductivity of fluid

L:

Characteristics length of pipe

ln:

Natural logarithm

\(\dot{{\rm m}}\) :

Mass flow rate of fluid

Nu:

Local Nusselt number based on bulk temperature of the fluid

Nut :

Convective heat transfer coefficient of tube

Nup :

Convective heat transfer coefficient of plain tube

p:

Pitch length/spacing

P:

Static pressure

Pr:

Prandtl number

ΔP:

Pressure drop over length L of pipe

r:

Pipe radius

Re:

Reynolds number

Ts :

Surface temperature

T∞ :

Bulk temperature

T:

Temperature

Cp :

Specific heat capacity

L:

Characteristic length of pipe

m:

Mean

max:

Maximum

min:

Minimum

PT:

Plain tube

t:

Turbulator

Theo:

Theoretical

Exp.:

Experimental

o:

Outlet, outer

i:

Inlet, inner

a:

Air

w:

Pipe wall

λ:

Darcy friction factor

η:

Thermal performance

μ:

Fluid viscosity

ν:

Kinematic viscosity

ρ:

Fluid density

Δ:

Net change in quantity

τ:

Shear stress

β:

Coefficient of thermal expansion

DCST-C:

Divergent convergent spring turbulator-circular

DPHE:

Double pipe heat exchanger

LPH:

Liter per hour

LPM:

Liter per minute

RTD:

Resistance temperature detectors

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Authors and Affiliations

  1. Amity University Uttar Pradesh, Noida, India

    Kushal Kamboj, Rohit Sharma, Dilbagh Panchal & Jaspreet Hira

  2. Mechanical Engineering Department, PEC University of Technology, Chandigarh, 160012, India

    Gurjeet Singh

Authors
  1. Kushal Kamboj
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  2. Gurjeet Singh
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  3. Rohit Sharma
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  4. Dilbagh Panchal
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  5. Jaspreet Hira
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Corresponding author

Correspondence to Kushal Kamboj.

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The authors declare no conflict of interest.

Appendix

Appendix

See Tables 1, 2, 3, 4 and 5.

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Kamboj, K., Singh, G., Sharma, R. et al. Heat transfer augmentation in double pipe heat exchanger using mechanical turbulators. Heat Mass Transfer 53, 553–567 (2017). https://doi.org/10.1007/s00231-016-1838-x

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