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Numerical analysis of flow and heat transfer in a shell and tube heat exchanger in the gas recirculation cooling system of a diesel engine and the effect of nanofluid on its performance

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Abstract

In the present study, the nanofluid flow and heat transfer in a shell and tube heat exchanger have been simulated in three dimensions. The hot fluid is the combustion gaseous product of a diesel engine, and the coolant is considered the shell of pure water, seawater, and CuO-water nanofluid with \(\varphi =\) 2 and 4%. The present study aims to reduce the temperature of exhaust gases from the heat exchanger, which is used at the inlet of the diesel engine gas recirculation system. The velocities of the hot gases and the coolant liquid based on Reynolds numbers, (respectively, Regas and Rewater), various fluids, and the volume fraction of the nanofluid \(\left( \varphi \right)\) are studied in this research. Moreover, the effect of twisted tape and baffle on the thermal performance of the heat exchanger is investigated. Examination of the base fluid shows that the change of the base fluid from pure water to seawater decreases the thermal efficiency of the heat exchanger by 3% and also increases the outlet gas temperature. Also, the pressure drop due to seawater is 16% higher than that of pure water. According to the results, the effect of twisted tape on improving thermal performance is higher than baffles. The analysis of thermal performance shows that the maximum convective heat transfer coefficient is obtained in the condition that the twisted tape with TR = 4 is used in the shell part, which is 119 W m−2 K−1. According to the results, the use of nanoparticles in the base fluid with twisted tape, despite the increase in heat transfer, reduces the thermal performance. The use of nanoparticles in seawater also increases heat transfer; however, it considerably increases the friction factor.

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Abbreviations

A 0 :

Cross-sectional area [m2]

C P :

Specific heat capacity [J Kg−1 K−1]

D h :

Hydraulic diamete [m]

\(\bar{P}\) :

Pressure [Pa]

d f :

Diameter of the base fluid molecule [m]

d s :

Diameter of the nanoparticle molecule [m]

k b :

Boltzmann constant [J K−1]

h :

Heat transfer coefficient [W m−2 K−1]

Re :

ReReynolds number

L :

Length of the heat exchanger [m]

Nu :

Nusselt number

Pe :

Péclet number

T:

Temperature [K]

f :

Friction factor

k :

Thermal conductivity [W m−1 K−1]

u:

Velocity [m s−1]

η :

Thermal performance

µ :

Viscosity [Pa s]

ρ :

Density [kg m−3]

φ :

Volume fraction

ave:

Average

f :

Fluid

in :

Inlet

nf :

Nanofluid

out :

Outlet

s :

Solid

t :

Turbulence

w:

Wall

LM :

Logarithmic mean temperature difference

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Authors and Affiliations

  1. Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran

    Mohammad Rasoul Ahmadi & Davood Toghraie

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  1. Mohammad Rasoul Ahmadi
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  2. Davood Toghraie
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Correspondence to Davood Toghraie.

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Ahmadi, M.R., Toghraie, D. Numerical analysis of flow and heat transfer in a shell and tube heat exchanger in the gas recirculation cooling system of a diesel engine and the effect of nanofluid on its performance. J Therm Anal Calorim 147, 4853–4871 (2022). https://doi.org/10.1007/s10973-021-10831-1

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