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Prediction of the outlet temperatures in triple concentric—tube heat exchangers in laminar flow regime: case study

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Abstract

In this study there has been developed a numerical model of predicting outlet temperatures in a triple concentric-tube heat exchanger. For the model elaboration there have been used the equations of heat transfer and of fluid-dynamics, as well as a numerical algorithm to solve systems of non-linear equations. Based on experimental data, the obtained model has been practically tested to cool a petroleum product with water in a triple concentric-tube heat exchanger. The results obtained using the numerical simulation have been compared with the experimental data and data from literature in order to validate the proposed numerical model.

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Abbreviations

A :

Heat transfer area, A = πdL (m2)

c p :

Specific heat (J/kg °C)

d :

Diameter (m)

h :

Local heat transfer coefficient (W/m2 °C)

L :

Length (m)

m :

Mass flow rate (kg/s)

N :

Number of the data points

Nu :

Number Nusselt

Pr :

Number Prandtl

Re :

Number Reynolds

T :

Temperature (°C)

U :

Overall heat transfer coefficient (W/m2°C)

w :

Linear average velocity (m/s)

ρ :

Density (kg/m3)

μ :

Dynamic viscosity (kg/ms)

ϑ :

Kinematic viscosity (m2/s)

λ:

Thermal conductivity (W/m °C)

e:

Equivalent

i:

Inner

in:

Inlet

o:

Outer

out:

Outlet

w:

Wall

1:

Central tube

2:

Intermediate tube (inner annular)

3:

External tube (outer annular)

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Authors and Affiliations

  1. Automatic Control, Computers and Electronics Department, Petroleum-Gas University of Ploieşti, B-dul Bucureşti, nr. 39, PO BOX 52, 100680, Ploieşti, Romania

    Cristian Pătrăşcioiu

  2. Petroleum Processing and Environmental Protection Engineering Department, Petroleum-Gas University of Ploieşti, PO BOX 52, B-dul Bucureşti, nr. 39, 100680, Ploieşti, Romania

    Sînziana Rădulescu

Authors
  1. Cristian Pătrăşcioiu
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  2. Sînziana Rădulescu
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Correspondence to Cristian Pătrăşcioiu.

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Pătrăşcioiu, C., Rădulescu, S. Prediction of the outlet temperatures in triple concentric—tube heat exchangers in laminar flow regime: case study. Heat Mass Transfer 51, 59–66 (2015). https://doi.org/10.1007/s00231-014-1385-2

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  • DOI: https://doi.org/10.1007/s00231-014-1385-2

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