Combined Free and Forced Convection Laminar Heat Transfer in a Vertical Annulus

Maitra, D.; Raju, K. S. N.

doi:10.1115/1.3450263

Cited by 48 publications

(16 citation statements)

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“…We also decreased Re by half, i.e., Re = 75 and Pr = 10, and came up with the three points below the solid line. The solid line and those points above it and below it form a narrow band that resembles the data pattern given in the experimental results of Maitra and Raju [18]. Similar results are obtained for fluids of Pr = 1 and higher Re of 500,1000, and 2000 as shown in Figure 2b, along with the data of Maitra and Raju [18].…”

Section: Dimensionless Heat Transfer Coefficient: Nusupporting

confidence: 87%

“…In Figure 2a the solid line represents the case of a constant Re of 150 and Pr of 10. The solid line displays a trend similar to that of the experimental data of Maitra and Raju [18], i.e., Nu increases monotonically with Ra, and the rate of increase slows gradually. In order to examine whether Re is a sensitive parameter, we doubled it, i.e., Re = 300 and Pr = 10, and obtained three points above the solid line.…”

Section: Dimensionless Heat Transfer Coefficient: Nusupporting

confidence: 58%

“…The solid line and those points above it and below it form a narrow band that resembles the data pattern given in the experimental results of Maitra and Raju [18]. Similar results are obtained for fluids of Pr = 1 and higher Re of 500,1000, and 2000 as shown in Figure 2b, along with the data of Maitra and Raju [18]. Although Maitra and Raju [18] used a vertical annulus in their experiments, close resemblance is found between the two sets of results.…”

Section: Dimensionless Heat Transfer Coefficient: Numentioning

confidence: 52%

“…In the past, some experimental data, for example, Maitra and Raju [18] for mixed convection in a vertical annulus, and theoretical predictions [3] tend to suggest that Nu is mainly a function of Ra, even though parameters such as Ri, Re, and Pr are possible contributing factors to Nu. It should be remembered that Ra relates to those parameters in the form of Ra = ReZ Ri Pr.…”

Section: Dimensionless Heat Transfer Coefficient: Numentioning

confidence: 96%

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Flow Structures and Heat Transfer During Transition in Perturbed Mixed-Convection Channel Flows

Hao

Chung

1995

Numerical Heat Transfer, Part A: Applications

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This research seek lo increase our understnnding of fluid mechanics and heaf transfer phenomena in transitional mired-convection Jows between two heated vertical plates. A direct numerikal simulation by the spectral method with weak formulation is used lo sobe the transient three-dimensional (3-0) Nauier-Stokes equations and energy equation. Initial disturbances consist oflhefinite amplitude two-dimensional Tollmien-Schlichting wave and two 3-D oblique waves. The NusseU number (Nu) is mainly a function of the Rayleigh number (Ra) and alro depends on the Reynolds number (Re) and the RichardFon number (Ri). Nu dependence on Re increases with increase of Ra. Disturbance competitions among different modes during transition are shown for different sets of dimensionless parameters.

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Section: Dimensionless Heat Transfer Coefficient: Nusupporting

confidence: 87%

Section: Dimensionless Heat Transfer Coefficient: Nusupporting

confidence: 58%

Section: Dimensionless Heat Transfer Coefficient: Numentioning

confidence: 52%

Section: Dimensionless Heat Transfer Coefficient: Numentioning

confidence: 96%

See 2 more Smart Citations

Flow Structures and Heat Transfer During Transition in Perturbed Mixed-Convection Channel Flows

Hao

Chung

1995

Numerical Heat Transfer, Part A: Applications

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“…Numerical solutions for fully developed mixed convection in a vertical circular tube are available [2,31. Developing and fully developed mixed convection in vertical parallelplate channels has been considered [4-71, and results for fully developed mixed convection in a vertical concentric annulus are also available [8]. In addition to these simple duct geometries, fully developed mixed convection in vertical passages with fins has also been studied.…”

Section: Introductionmentioning

confidence: 99%

Laminar, Fully Developed Mixed Convection in a Vertical Eccentric Annulus

Sathyamurthy¹,

Karki

Patankar

1992

Numerical Heat Transfer, Part A: Applications

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This paper presents a numerical study of h i n a r , fully developed mixed convection inverhrhcal eccentric annulor ducts. The equations governing the velocity and tempemture are solved on a bodysonfonning grid by using a finite-volume technique. The effects of rndius mfio, eccentricity, and Rnyleigh number on the friction factor and the Nusselt number are discussed. The buoyancy forces significantly increase both friction and heat tmnsfer. The effect of buoyancy is stronger for configurntion with larger eccentricities.

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Significance of time‐dependent magnetohydrodynamic transient free convective flow in vertical annuli: An analytical approach with the finite Hankel transform

Maurya

Singh

2021

Heat Trans

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An analytical study is accomplished by using the Finite Hankel Transform Technique for the variation of the temperature and the velocity profile with several nondimensional parameters. In this problem, an electrically conducting fluid has been considered in the vertical concentric annulus, with a perpendicular radial magnetic field. Furthermore, a closed and exact type of expression for the velocity and the temperature are received in the form of Bessel functions of both kinds (first and second). The impact of emerging parameters in this model, such as time, Hartmann number, Prandtl number, and the annular gap between the cylinders, is discussed through graphs, whereas the numerical values of the skin friction, mass flux, and the Nusselt number are given in the tabular form. As a consequence of this, it is detected that the velocity and temperature distributions are increasing continuously with an enhanced time scale. Eventually, it gains its steady state very quickly. Moreover, the impact of the Prandtl number and the Hartmann number leads to a decrease in the velocity profiles.

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Combined Free and Forced Convection Laminar Heat Transfer in a Vertical Annulus

Cited by 48 publications

References 0 publications

Flow Structures and Heat Transfer During Transition in Perturbed Mixed-Convection Channel Flows

Flow Structures and Heat Transfer During Transition in Perturbed Mixed-Convection Channel Flows

Laminar, Fully Developed Mixed Convection in a Vertical Eccentric Annulus

Significance of time‐dependent magnetohydrodynamic transient free convective flow in vertical annuli: An analytical approach with the finite Hankel transform

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