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Heat and Mass Transfer

, Volume 51, Issue 11, pp 1607–1630 | Cite as

Flow and heat transfer enhancement in tube heat exchangers

  • Sayed Ahmed E. Sayed Ahmed
  • Osama M. Mesalhy
  • Mohamed A. AbdelatiefEmail author
Review

Abstract

The performance of heat exchangers can be improved to perform a certain heat-transfer duty by heat transfer enhancement techniques. Enhancement techniques can be divided into two categories: passive and active. Active methods require external power, such as electric or acoustic field, mechanical devices, or surface vibration, whereas passive methods do not require external power but make use of a special surface geometry or fluid additive which cause heat transfer enhancement. The majority of commercially interesting enhancement techniques are passive ones. This paper presents a review of published works on the characteristics of heat transfer and flow in finned tube heat exchangers of the existing patterns. The review considers plain, louvered, slit, wavy, annular, longitudinal, and serrated fins. This review can be indicated by the status of the research in this area which is important. The comparison of finned tubes heat exchangers shows that those with slit, plain, and wavy finned tubes have the highest values of area goodness factor while the heat exchanger with annular fin shows the lowest. A better heat transfer coefficient ha is found for a heat exchanger with louvered finned and thus should be regarded as the most efficient one, at fixed pumping power per heat transfer area. This study points out that although numerous studies have been conducted on the characteristics of flow and heat transfer in round, elliptical, and flat tubes, studies on some types of streamlined-tubes shapes are limited, especially on wing-shaped tubes (Sayed Ahmed et al. in Heat Mass Transf 50: 1091–1102, 2014; in Heat Mass Transf 51: 1001–1016, 2015). It is recommended that further detailed studies via numerical simulations and/or experimental investigations should be carried out, in the future, to put further insight to these fin designs.

Keywords

Heat Transfer Heat Exchanger Heat Transfer Enhancement Heat Transfer Performance Finned Tube 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

List of symbols

Alphabet—upper case

Fp

Fin pitch [m (fin spacing + fin thickness)]

S

Fin spacing (m)

D

Tube outside diameter (m)

Nu

Nusselt number [(h Deq)/k]

Pdc

Pressure drop coefficient [(2 ∆Pa)/(ρaf V a 2 )]

Pr

Prandtl number [(μ cp)/k]

N

Number of tube rows

j

Colburn j factor (j = St Pr2/3)

Re

Reynolds number [(ρ V Deq)/μ]

St

Stanton number [Nu/(Re a Pr)]

T

Temperature (K)

f ≡ Pdc

Friction factor [(2 ∆Pa)/(ρaf V a 2 )]

Va

Air velocity (m/s)

Wf

Fin width (m)

SL ≡ PL

Longitudinal tube pitch (m)

ST ≡ PT

Transverse tube pitch (m)

Sw

Slit width (m)

Ll

Louver length (m)

Lp

Louver pitch (m)

Lh

Louver height (m)

Lt

Louver thickness (m)

Str

Stroughal number

Ga =  j/f

Area goodness factor

Gv =  St/f1/3

Volume goodness factor

Eu

Euler number

RH

Relative humidity (%)

B

Surface emissivity parameter, dimensionless

Alphabet—lower case

m

Mass flow rate (kg/s)

ha

Heat transfer coefficient (W/m2 K)

k

Thermal conductivity (W/m K)

hf

Fin height (m)

n

Exponent

Greek symbols

δ

Fin thickness (m)

μ

Absolute viscosity (Pa s)

ηf

Fin efficiency

ρ

Density (kg/m3)

θ

Louver angle (°)

Irreversibility distribution ratio

∆Pa

Pressure drop (Pa)

Subscripts

a

Air

f

Fin

p

Pitch

h

Height

L

Longitudinal

T

Transverse

l

length

t

Thickness

w

Width

eq

Equivalent

Abbreviation

DTM

Differential transformation method

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Sayed Ahmed E. Sayed Ahmed
    • 1
  • Osama M. Mesalhy
    • 1
  • Mohamed A. Abdelatief
    • 1
    Email author
  1. 1.Mechanical Power Engineering Department, Faculty of EngineeringZagazig UniversityZagazigEgypt

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