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Journal of Mechanical Science and Technology

, Volume 33, Issue 11, pp 5515–5525 | Cite as

Numerical study of hydrodynamic and thermodynamic characteristics of a heat exchanger muffler

  • Meng YuanEmail author
  • Pingjian Ming
  • Wenping Zhang
Article
  • 6 Downloads

Abstract

The hydrodynamic and thermodynamic characteristics of a heat exchanger muffler (HEM), which can reduce the size of a marine engine exhaust system with waste heat recovery, were investigated using a numerical simulation method that combines the porous media model and the dual cell heat exchanger model. The effect of the thermal conductivity and dynamic viscosity of the exhaust gas on the heat transfer and pressure loss of the equipment was studied. The relationship between the heat transfer and the pressure drop of the equipment for various mass flow rates of the exhaust gas was investigated. It is shown that heat transfer conditions of the HEM could be enhanced by increasing the thermal conductivity or dynamic viscosity of the exhaust gas. To further improve the performance of the HEM, a design modification for optimizing the structure of the guide blade was proposed and numerically validated.

Keywords

Dual-cell heat exchanger Heat exchanger muffler Porous media model Thermal conductivity Temperature field 

Nomenclature

A

Heat transfer area of the heat exchanger (m2)

C1

Viscous resistance coefficient (m-2)

c1

The specific heat capacity of hot fluid (kJ/(kg*K))

C2

Inertial resistance coefficient (m−1)

c2

The specific heat capacity of cold fluid (kJ/(kg*K))

k

Turbulent kinetic energy (J)

k′

Heat transfer coefficient (W/(m *K))

Δn

The thickness of the porous media (m)

Δp

Pressure loss (Pa)

ΔP

Pressure difference between inlet and outlet (Pa)

ΔPr

The relative value of the pressure value

Φ

The heat transfer power of the equipment (kW)

ΔQr

The relative value of the pressure value

qm1

Mass flow rate of hot fluid (kg/s)

qm2

Mass flow rate of cold fluid (kg/s)

RER

Relative error

RNG

Renormalization group

re

Experimental result

rs

Simulation result

S

The source term

ΔT

Temperature difference between inlet and outlet (°C)

t1

The inlet temperature of hot fluid (°C)

t1

The outlet temperature of hot fluid (°C)

t2

The inlet temperature of cold fluid (°C)

t2

The outlet temperature of cold fluid (°C)

Δtm

The logarithmic mean temperature difference (°C)

v

Viscosity (m/s)

α

Porosity of the porous media

μ

The dynamic viscosity (N*s/m2)

ρ

Density (kg/m3)

ϕ

General variable

Γ

Diffusion coefficient

ε

Dissipation rate of kinetic energy (%)

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Notes

Acknowledgments

This work is supported by the Project of Marine Low-Speed Engine Project-Phase I of Harbin Engineering University.

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Copyright information

© KSME & Springer 2019

Authors and Affiliations

  1. 1.College of Power and Energy EngineeringHarbin Engineering UniversityHarbinChina

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