Optimization study and heat transfer comparison of staggered circular and elliptic tubes in forced convection

Matos, R. S.; Vargas, J.V.C.; Laursen, Tod A.; Saboya, F. E. M.

doi:10.1016/s0017-9310(01)00006-0

Cited by 105 publications

(66 citation statements)

References 17 publications

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“…3. The reason for using an L length before and after the tubes is discussed in the work of Stanescu, Fowler and Bejan (1996) and Matos et al (2001). The boundary conditions indicated in Fig.…”

Section: Definition Of the Problemmentioning

confidence: 99%

“…The variable of interest of the problem is the dimensionless overall thermal conductance (Q) of the heat exchanger, defined in Stanescu, Fowler and Bejan (1996) and Matos et al (2001) as:…”

Section: Definition Of the Problemmentioning

confidence: 99%

“…The advective terms of the mathematical model were discretized with an upwind scheme (Hughes, 1978). Details of the numerical methodology are given in the work of Matos et al (2001).…”

Section: Definition Of the Problemmentioning

confidence: 99%

“…Tables 1 and 2 present some of the numerical results (with 5,180 elements) of Matos et al (2001) for circular tubes, as well as the grids utilized. Table 1 indicates that the maximum value of Q is 3.55 in S/D = 1.0 for Re = 50, and Q is 5.71 in S/D = 0.5 for Re = 100.…”

Section: Definition Of the Problemmentioning

confidence: 99%

“…4) Programming error: includes human errors in the implementation and use of a computational program. The following will be presented in subsequent sections: the definition of the physical problem under consideration and its corresponding mathematical model; numerical results of Matos et al (2001) and of this work; the estimate of discretization errors based on Roache's (1994) GCI estimator; the estimate of the modeling errors; and the conclusion of this work. …”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Numerical solution of staggered circular tubes in two-dimensional laminar forced convection

Marchi¹,

Hobmeir²

2007

J. Braz. Soc. Mech. Sci. & Eng.

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Section: Definition Of the Problemmentioning

confidence: 99%

“…The variable of interest of the problem is the dimensionless overall thermal conductance (Q) of the heat exchanger, defined in Stanescu, Fowler and Bejan (1996) and Matos et al (2001) as:…”

Section: Definition Of the Problemmentioning

confidence: 99%

“…The advective terms of the mathematical model were discretized with an upwind scheme (Hughes, 1978). Details of the numerical methodology are given in the work of Matos et al (2001).…”

Section: Definition Of the Problemmentioning

confidence: 99%

Section: Definition Of the Problemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Numerical solution of staggered circular tubes in two-dimensional laminar forced convection

Marchi¹,

Hobmeir²

2007

J. Braz. Soc. Mech. Sci. & Eng.

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Second law optimization of heat exchangers in waste heat recovery

Erguvan

MacPhee

2019

Int J Energy Res

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Summary This paper numerically investigates the first and second law efficiencies of transient crossflow over tube banks. A significant number of simulations were performed using a commercial computational fluid dynamics (CFD) tool, ANSYS Fluent 18.2, with varying inlet temperature, Reynolds number, pitch ratio (PR), number of inline cylinders, and heat transfer coefficient defining a heat leakage on the system. Numerical results compare favorably with published data in terms of Nusselt number and pressure drop. Five hundred seventy‐six simulations were performed, and energy efficiencies ranged from 72% to 99%, while exergy efficiencies ranged from 26% to 70%. No discernable, universal trends were observed across all data sets, but the staggering amount of results spans a wide range of operational characteristics for tube bundle waste heat recovery. To illustrate the insight such data can provide, we consider four sample cases for analysis: well‐insulated low‐grade heat recovery, poorly insulated low‐grade heat recovery, well‐insulated high‐grade heat recovery, and poorly insulated high‐grade heat recovery. Low‐ and high‐grade heat recovery cases were simulated with differing inlet heat transfer fluid (HTF) values, and heat leakage was introduced as a source term in the 2D energy equation. Detailed descriptions of the efficiencies of all cases are described, with references to the immense body of simulation data included in the appendix. Overall, the highest efficiencies of the first and second laws were obtained in domains that have three cylinders and inlet temperature of 500 K and eight cylinders and an inlet temperature of 400 K, respectively. The main findings of this study could be beneficial in designing a highly efficient waste heat recovery system, especially when source temperatures vary.

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Convective Heat Transfer and Pressure Drop over Elliptical and Flattened Tube

Swain

Das

2014

Heat Trans. Asian Res.

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A numerical study on the effect of the effect of elliptical and flattened tube bundle geometry on the convective heat transfer and pressure drop is presented in this article. The analysis has been carried out to evaluate the performance of these bundle geometries in the design of a compact and effective single phase shell and tube heat exchanger. The temperature, velocity, and pressure drop profiles are obtained from solving the mass, momentum, and energy conservation equations. The comparison is made for inline and staggered bundle with different pitch to diameter ratio and inlet velocity for elliptical and flattened tubes. The pitch to diameter ratio is varied from 1.25 to 2.5 for Reynolds number ranging from 200 to 2000 which is in the laminar flow region. The heat transfer coefficient over the staggered and inline tube bundle decrease with an increase in pitch. The same kind of variation is also observed for the pressure drop in the case of both elliptical and flattened tube bundle. The study shows that the transverse pitch with respect to cross flow affects more than the longitudinal pitch.

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Optimization study and heat transfer comparison of staggered circular and elliptic tubes in forced convection

Cited by 105 publications

References 17 publications

Numerical solution of staggered circular tubes in two-dimensional laminar forced convection

Numerical solution of staggered circular tubes in two-dimensional laminar forced convection

Second law optimization of heat exchangers in waste heat recovery

Convective Heat Transfer and Pressure Drop over Elliptical and Flattened Tube

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