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An advanced turbulator with blades and semi-conical section for heat transfer improvement in a helical double tube heat exchanger

一种改进螺旋双管换热器传热性能的叶片半圆锥形紊流器

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Abstract

In present work, a helical double tube heat exchanger is proposed in which an advanced turbulator with blades, semi-conical part, and two holes is inserted in inner section. Two geometrical parameters, including angle of tabulator’s blades (θ) and number of tabulator’s blades (N), are considered. Results indicated that firstly, the best thermal stratification is achieved at θ=180°. Furthermore, at the lowest studied mass flow rate (\(\dot m = 8 \times {10^{ - 3}}\,{\rm{kg}}/{\rm{s}}\)), heat transfer coefficient of turbulator with blade angle of 180° is 130.77%, 25%, and 36.36% higher than cases including without turbulator, with turbulator with blade angle of θ=240°, and θ =360°, respectively. Moreover, case with N=12 showed the highest overall performance. At the highest studied mass flow rate (\(\dot m = 5.842 \times {10^{ - 2}}{\rm{kg}}/{\rm{s}}\)), heat transfer coefficient for case with N=12 is up to 54.76%, 27.45%, and 6.56% higher than cases including without turbulator, with turbulator with N=6, and with turbulator with N=9, respectively.

摘要

本文提出了一种内部具有叶片及半圆锥形双孔紊流器的螺旋双管换热器。研究了紊流叶片角θ和紊流叶片数N 对传热性能的影响。结果表明: 热分层在θ=180°时达到最佳; 在最小质量流率(ṁ=8×10−3 kg/s)条件下, 叶片倾角为180°的紊流器的换热系数比不含紊流器、及叶片倾角为240°和360°的紊 流器分别高130.77%、25% 和36.36%。N=12 的综合性能表现最好。在最大质量流率下(ṁ=5.842×10−2 kg/s), N=12 时的换热系数比无紊流器、叶片数为6 和9 时的换热系数分别提高了54.76%、27.45% 和6.56%。

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Abbreviations

c p :

Specific heat capacity, kJ/(kg·K)

D i :

Diameter of cold channel, m

d i :

Diameter of hot channel, m

f :

Darcy friction factor

g :

Gravitational acceleration, m/s2

h :

Heat transfer coefficient, W/(m2·K)

h t :

Height of the tabulator’s blades, m

k :

Thermal conductivity, W/(m·K)

N :

Blade number of the tabulator

P :

Pressure, Pa

R :

Radius of the heat exchanger round, m

R C :

Radius of the coil, m

R i :

Inner radius of the proposed Turbulator, m

R o :

Outer radius of the proposed Turbulator, m

r :

Radius of the channel of the Turbulator, m

r i :

Radius of the Turbulator’s holes, m

S :

Source term, kJ/m3

T :

Temperature, °C

t :

Time, s

u :

Fluid velocity, m/s

w :

Thickness of the turbulator’s blades, m

Pr :

Prandtl number [Pr=(cp·μ)/k]

Pe :

Péclet number [Pe = Re·Pr]

Re :

Reynolds number [Re=(ρ·u·d)/μ]

Nu :

Nusselt number [Nu=(h·d)/k]

ρ :

Density, kg/m3

μ :

Viscosity, Pa·s

θ :

Angle of the tabulator’s blades, (°)

η :

Overall performance

0:

Reference

m:

Average

h:

Hydraulic

t:

Turbulator

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Authors and Affiliations

  1. Department of Mechanical Engineering, Babol Noshirvani University of Technology, Babol, Mazandaran, Iran

    Seyed Hossein Hashemi Karouei & Seyed Soheil Mousavi Ajarostaghi

  2. Department of Energy, Faculty of New Science and Technologies, Semnan University, Semnan, Iran

    Saman Rashidi

  3. Department of Chemical, Petroleum, and Gas Engineering, Semnan University, Semnan, Iran

    Elham Hosseinirad

Authors
  1. Seyed Hossein Hashemi Karouei
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  2. Seyed Soheil Mousavi Ajarostaghi
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  3. Saman Rashidi
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  4. Elham Hosseinirad
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Contributions

The overarching research goals were developed by Seyed Hossein HASHEMI KAROUEI and Seyed Soheil MOUSAVI AJAROSTAGHI. Also, they performed the numerical simulations and analyzed the obtained results. The initial draft of the manuscript was written by Seyed Hossein HASHEMI KAROUEI, Seyed Soheil MOUSAVI AJAROSTAGHI, and Saman RASHIDI. The initial draft of the manuscript was edited by Elham HOSSEINIRAD. All authors replied to reviewers’ comments and revised the final version.

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Correspondence to Seyed Soheil Mousavi Ajarostaghi.

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Conflict of interest

Seyed Hossein HASHEMI KAROUEI, Seyed Soheil MOUSAVI AJAROSTAGHI, Saman RASHIDI, and Elham HOSSEINIRAD declare that they have no conflict of interest.

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Hashemi Karouei, S.H., Mousavi Ajarostaghi, S.S., Rashidi, S. et al. An advanced turbulator with blades and semi-conical section for heat transfer improvement in a helical double tube heat exchanger. J. Cent. South Univ. 28, 3491–3506 (2021). https://doi.org/10.1007/s11771-021-4870-z

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  • DOI: https://doi.org/10.1007/s11771-021-4870-z

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