Numerical simulation of forced convective heat transfer in inclined elliptic ducts with multiple internal longitudinal fins

Adegun, I. K.; Jolayemi, T.S.; Olayemi, Olalekan Adebayo; Ayodeji, A.

doi:10.1016/j.aej.2017.01.014

Cited by 17 publications

(9 citation statements)

References 17 publications

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“…As passive devices are easily installed and no external energy supply is required, these have been commonly implemented as alternative to active devices [66]. Examples of passive methods are rough surfaces [67,68]; artificial roughnessribs [69,70], corrugated surfaces [9,71,72], longitudinal fins [73]; extended surfacesbaffles [59,74,75]; swirl flow devices [76,77]; coiled tubes [78][79][80]; and flow additives as nanofluids (NF). NFs are produced by the addition of suspended nanoparticles (e.g.…”

Section: Heat Exchangersmentioning

confidence: 99%

Overview on the hydrodynamic conditions found in industrial systems and its impact in (bio)fouling formation

Fernandes

Gomes

Simões

et al. 2021

Chemical Engineering Journal

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Biofouling is the unwanted accumulation of deposits on surfaces, composed by organic and inorganic particles and (micro)organisms. Its occurrence in industrial equipment is responsible for several drawbacks related to operation and maintenance costs, reduction of process safety and product quality, and putative outbreaks of pathogens. The understanding on the role of operating conditions in biofouling development highlights the hydrodynamic conditions as key parameter. In general, (bio)fouling occurs in a higher extension when laminar flow conditions are used. However, the characteristics and resilience of biofouling are highly dependent on the hydrodynamic conditions under which it is developed, with turbulent conditions being associated to recalcitrant biodeposits. In industrial settings like heat exchangers, fluid distribution networks and stirred tanks, hydrodynamics plays a dual function, affecting the process effectiveness while favouring biofouling formation. This review summarizes the hydrodynamics played in conventional industrial settings and provides an overview on the relevance of hydrodynamic conditions in biofouling development as well as in the effectiveness of industrial processes.

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Section: Heat Exchangersmentioning

confidence: 99%

Overview on the hydrodynamic conditions found in industrial systems and its impact in (bio)fouling formation

Fernandes

Gomes

Simões

et al. 2021

Chemical Engineering Journal

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“…Adegun [1] presented the numerical simulation of enhanced forced convective heat transfer in inclined elliptic ducts withmultiple internal longitudinal fins. Hajmohammadi [2] presented theoptimal design of tree-shaped inverted fins penetrated into heat generating bodies to enhance the heat transfer rate.…”

Section: Literature Reviewmentioning

confidence: 99%

Enhancement of Heat Transfer Coefficient through Forced Convection Apparatus by Using Circular and Elliptical Pipe

Shahane¹,

Ghodake²,

Kashid³

et al. 2019

International Journal of New Technology and Research

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It is very essential to develop a forced convection system to carry out the analytical and experimental investigation of the heat transfer coefficient with the use of the elliptical and circular pipe. Convection is nothing but the transfer of heat through a fluid which is in bulk fluid motion. Depending on the motion of the fluid, it is classified as natural and forced convection. Buoyancy effect is the natural cause which occurs due to fluid motion in natural convection. On the other hand, in forced convection, the motion of the fluid is caused by external means like a pump or fan. In this system three, 130 Volt heaters are wounded over 800 mm test section of Circular pipe having a 25mm diameter and Elliptical pipe having 22 mm minor and 28 mm major diameter. Variable dimmer stat is used to control input to heater and control valve to control mass flow rate, to determine the average coefficient of heat transfer in turbulent flows inside smooth and straight Circular and Elliptical pipes. The research consists of a regression analysis performed between the Reynolds number and the Prandtl number finally to calculate the heat transfer coefficient of Circular and Elliptical pipes by experimental investigation. After calculating all the results of both the pipes finally we got that efficiency of Elliptical pipe is more than circular pipe also heat transfer coefficient is maximum in the elliptical pipe than the circular pipe and it also led to increasing the heat transfer rates. The deviation of the heat transfer coefficient is maximum as compared to Elliptical pipe.

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“…Over the years, understanding the dynamics of flows in a lid‐driven enclosure for different scenarios of flow regimes has been extensively discussed by researchers. This is because of the ability of flows in enclosures to effectively provide cooling solutions to systems 1–6 . The popularity enjoyed by the bounded cavity problem among researchers is not only due to the simplicity of the geometry but also due to the practical significance of the subject.…”

Section: Introductionmentioning

confidence: 99%

Parametric studies of mixed convective fluid flow around cylinders of different cross‐sections

Olayemi

Obalalu²,

Ibitoye

et al. 2023

Heat Trans

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A numerical study of mixed convective heat transfer in a lid‐driven square enclosure containing a hot elliptic cylinder is conducted. The impacts of the Grashof number , Reynolds number , cylinder tilt angle , and aspect ratio have been examined for a fluid of of 0.71. The horizontal enclosure walls are insulated, while its vertical walls are restricted to a nonvarying temperature Tc, whereas a sinusoidal temperature of is imposed on the wall of the elliptical cylinder. The governing equations are solved using COMSOL Multiphysics 5.6 software. The fluid dynamic and the heat transport profiles between the enclosure and the elliptical cylinder walls are represented by the stream function, isothermal contours, and average Nusselt number. Results established that for all the considered aspect ratios, the thermal heating range of is predominantly a conduction mechanism. The critical position of the ellipse where the inclination effect becomes insignificant is determined by the Grashof number and aspect ratio when the Re = 100. The strength of vortices and cell numbers are significantly influenced by the aspect ratio, particularly when the . When , the average heat transfer from the cylinder remains the same regardless of the cylinder's orientation. The impact of cylinder orientation on heat transfer from the cylinder wall is minimal for . For AR values of , increasing the inclination angle does not result in improved heat transfer. The influence of the increasing inclination angle on the right wall diminishes as the angle increases, except when the Grashof number is greater than 105, where the rate of heat transfer is enhanced for inclination angles beyond 45°.

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Numerical simulation of forced convective heat transfer in inclined elliptic ducts with multiple internal longitudinal fins

Cited by 17 publications

References 17 publications

Overview on the hydrodynamic conditions found in industrial systems and its impact in (bio)fouling formation

Overview on the hydrodynamic conditions found in industrial systems and its impact in (bio)fouling formation

Enhancement of Heat Transfer Coefficient through Forced Convection Apparatus by Using Circular and Elliptical Pipe

Parametric studies of mixed convective fluid flow around cylinders of different cross‐sections

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