# Convection heat transfer in a shell-and-tube heat exchanger using sheet fins for effective utilization of energy

Koichi Nakaso, Hiroki Mitani, Jun Fukai

Research output: Contribution to journalArticle

8 Citations (Scopus)

### Abstract

Convection heat transfer in a shell-and-tube heat exchanger using sheet fins is numerically investigated. Heat and mass transfers in the heat exchanger are modeled under steady state to estimate the heat transfer rate and the pressure drop for various geometries of the heat exchanger. Based on the numerical results, the Nusselt number and pressure drop are formulated for practical applications. For convenience, similar expressions to those of conventional shell-and-tube heat exchangers, that is, the functions of dimensionless numbers such as the Reynolds number, are derived. In these equations, the geometry of the heat exchanger, fin efficiency, and contact thermal resistance are included as major factors. On formulating the equation for the overall heat transfer rate, it is found that the heat transfer coefficient for the heat exchanger with a fin does not correspond to the combination of the heat transfer coefficient of bare tube surface and the fin. This is because the heat exchange area is substantially limited especially at the narrow space between the tube and the fin. A correction factor for the substantial heat transfer area is therefore introduced. These formulated equations are helpful for installing sheet fins in manufactured heat exchangers. Using the formulated equations, effective conditions to enhance heat transfer rate by the fin are established, taking into account the increase in pressure drop.

Original language English 581-587 7 International Journal of Heat and Mass Transfer 82 https://doi.org/10.1016/j.ijheatmasstransfer.2014.11.033 Published - 2015 Yes

### Fingerprint

tube heat exchangers
Heat convection
Fins (heat exchange)
Tubes (components)
fins
Heat exchangers
convection
heat transfer
heat exchangers
Heat transfer
Pressure drop
pressure drop
Heat transfer coefficients
energy
heat transfer coefficients
Geometry
Nusselt number
tubes
Heat resistance
dimensionless numbers

### Keywords

• Fin Heat transfer coefficient
• Heat exchanger
• Heat transfer enhancement
• Thermal contact resistance

### ASJC Scopus subject areas

• Condensed Matter Physics
• Mechanical Engineering
• Fluid Flow and Transfer Processes

### Cite this

In: International Journal of Heat and Mass Transfer, Vol. 82, 2015, p. 581-587.

Research output: Contribution to journalArticle

title = "Convection heat transfer in a shell-and-tube heat exchanger using sheet fins for effective utilization of energy",
abstract = "Convection heat transfer in a shell-and-tube heat exchanger using sheet fins is numerically investigated. Heat and mass transfers in the heat exchanger are modeled under steady state to estimate the heat transfer rate and the pressure drop for various geometries of the heat exchanger. Based on the numerical results, the Nusselt number and pressure drop are formulated for practical applications. For convenience, similar expressions to those of conventional shell-and-tube heat exchangers, that is, the functions of dimensionless numbers such as the Reynolds number, are derived. In these equations, the geometry of the heat exchanger, fin efficiency, and contact thermal resistance are included as major factors. On formulating the equation for the overall heat transfer rate, it is found that the heat transfer coefficient for the heat exchanger with a fin does not correspond to the combination of the heat transfer coefficient of bare tube surface and the fin. This is because the heat exchange area is substantially limited especially at the narrow space between the tube and the fin. A correction factor for the substantial heat transfer area is therefore introduced. These formulated equations are helpful for installing sheet fins in manufactured heat exchangers. Using the formulated equations, effective conditions to enhance heat transfer rate by the fin are established, taking into account the increase in pressure drop.",
keywords = "Fin Heat transfer coefficient, Heat exchanger, Heat transfer enhancement, Thermal contact resistance",
author = "Koichi Nakaso and Hiroki Mitani and Jun Fukai",
year = "2015",
doi = "10.1016/j.ijheatmasstransfer.2014.11.033",
language = "English",
volume = "82",
pages = "581--587",
journal = "International Journal of Heat and Mass Transfer",
issn = "0017-9310",
publisher = "Elsevier Limited",

}

TY - JOUR

T1 - Convection heat transfer in a shell-and-tube heat exchanger using sheet fins for effective utilization of energy

AU - Nakaso, Koichi

AU - Mitani, Hiroki

AU - Fukai, Jun

PY - 2015

Y1 - 2015

N2 - Convection heat transfer in a shell-and-tube heat exchanger using sheet fins is numerically investigated. Heat and mass transfers in the heat exchanger are modeled under steady state to estimate the heat transfer rate and the pressure drop for various geometries of the heat exchanger. Based on the numerical results, the Nusselt number and pressure drop are formulated for practical applications. For convenience, similar expressions to those of conventional shell-and-tube heat exchangers, that is, the functions of dimensionless numbers such as the Reynolds number, are derived. In these equations, the geometry of the heat exchanger, fin efficiency, and contact thermal resistance are included as major factors. On formulating the equation for the overall heat transfer rate, it is found that the heat transfer coefficient for the heat exchanger with a fin does not correspond to the combination of the heat transfer coefficient of bare tube surface and the fin. This is because the heat exchange area is substantially limited especially at the narrow space between the tube and the fin. A correction factor for the substantial heat transfer area is therefore introduced. These formulated equations are helpful for installing sheet fins in manufactured heat exchangers. Using the formulated equations, effective conditions to enhance heat transfer rate by the fin are established, taking into account the increase in pressure drop.

AB - Convection heat transfer in a shell-and-tube heat exchanger using sheet fins is numerically investigated. Heat and mass transfers in the heat exchanger are modeled under steady state to estimate the heat transfer rate and the pressure drop for various geometries of the heat exchanger. Based on the numerical results, the Nusselt number and pressure drop are formulated for practical applications. For convenience, similar expressions to those of conventional shell-and-tube heat exchangers, that is, the functions of dimensionless numbers such as the Reynolds number, are derived. In these equations, the geometry of the heat exchanger, fin efficiency, and contact thermal resistance are included as major factors. On formulating the equation for the overall heat transfer rate, it is found that the heat transfer coefficient for the heat exchanger with a fin does not correspond to the combination of the heat transfer coefficient of bare tube surface and the fin. This is because the heat exchange area is substantially limited especially at the narrow space between the tube and the fin. A correction factor for the substantial heat transfer area is therefore introduced. These formulated equations are helpful for installing sheet fins in manufactured heat exchangers. Using the formulated equations, effective conditions to enhance heat transfer rate by the fin are established, taking into account the increase in pressure drop.

KW - Fin Heat transfer coefficient

KW - Heat exchanger

KW - Heat transfer enhancement

KW - Thermal contact resistance

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U2 - 10.1016/j.ijheatmasstransfer.2014.11.033

DO - 10.1016/j.ijheatmasstransfer.2014.11.033

M3 - Article

AN - SCOPUS:84919631509

VL - 82

SP - 581

EP - 587

JO - International Journal of Heat and Mass Transfer

JF - International Journal of Heat and Mass Transfer

SN - 0017-9310

ER -