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Silver–water nanofluid flow and convective heat transfer in a microfin tube equipped with loose-fit twisted tapes

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Abstract

Heat transfer enhancement and performance of compact heat exchangers have been extensively studied in the past century for the purpose of promoting energy efficiency. Microfin tubes in single/two/multiple-phase flow heat exchangers into which twisted tape swirl generators are installed can promote heat transfer with a moderate pressure loss penalty. This article reports on the enhanced heat transfer of silver–water nanofluids in a microfin tube into which loose-fit twisted tapes are installed in a counter-flow arrangement. The experiments were carried out using nanofluids with various silver concentrations (0.007–0.03 vol%), loose-fit twisted tapes with clearance ratios (c/D) of 0.0 (tight-fit), 0.05, 0.075 and 0.1, for a twist ratio, y/W, of 2.0. The results indicate that the heat transfer rate (Nu) and pressure drop (f) increase with a decrease in clearance ratio (c/D) and increase in silver (Ag) nanoparticle concentration. Additionally, the thermal performance factor tends to increase with the decrease in Reynolds numbers.

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Abbreviations

A :

Heat transfer surface area (m2)

c p,w :

Specific heat capacity of water (J kg−1 K−1)

c p,np :

Specific heat capacity of silver nanoparticle (J kg−1 K−1)

c :

Clearance between the edge of fin and tape (m)

D h :

Hydraulic diameter of the microfin tube (m)

f :

Friction factor

h :

Heat transfer coefficient (W m−2 K−1)

k w :

Thermal conductivity of water (W m−1 K−1)

k nf :

Thermal conductivity of silver–water nanofluid (W m−1 K−1)

k np :

Thermal conductivity of silver nanoparticle (W m−1 K−1)

L :

Length of the test tube (m)

\(\dot{m}\) :

Mass flow rate (kg s−1)

Nu:

Nusselt number

P :

Pressure of flow (Pa)

ΔP :

Pressure drop (Pa)

Pr:

Prandtl number

Q :

Heat transfer rate (W)

Re:

Reynolds number

T :

Temperature (K)

\(\tilde{T}\) :

Mean temperature (K)

u :

Mean axial flow velocity (m s−1)

W :

Twisted tape width (m)

y :

Twist length (m)

ϕ :

Silver–water nanofluid concentration (% by volume)

ρ :

Fluid density (kg m−3)

δ :

Twisted tape thickness (m)

μ :

Fluid dynamic viscosity (kg s−1 m−1)

η :

Thermal performance factor

b:

Bulk

con:

Convection

c:

Cold

E:

Enhanced

NE:

Not enhanced

nf:

Nanofluid

np:

Nanoparticle

w:

Wall/water

C-MF:

Microfin tube fitted with twisted tape in counter arrangement

MF:

Microfin tube

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Authors and Affiliations

  1. Department of Mechanical Engineering, Faculty of Engineering, Mahanakorn University of Technology, Bangkok, 10530, Thailand

    P. Samruaisin & S. Eiamsa-ard

  2. Department of Chemical Engineering, Faculty of Engineering, Mahanakorn University of Technology, Bangkok, 10530, Thailand

    K. Wongcharee

  3. Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, 10520, Thailand

    V. Chuwattanakul

Authors
  1. P. Samruaisin
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  2. K. Wongcharee
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  3. V. Chuwattanakul
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  4. S. Eiamsa-ard
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Correspondence to V. Chuwattanakul.

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Samruaisin, P., Wongcharee, K., Chuwattanakul, V. et al. Silver–water nanofluid flow and convective heat transfer in a microfin tube equipped with loose-fit twisted tapes. J Therm Anal Calorim 140, 2541–2554 (2020). https://doi.org/10.1007/s10973-019-08984-1

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