Heat transfer characteristics of assisting and opposing laminar flow through a vertical circular tube at low Reynolds numbers

Everts, Marilize; Bhattacharyya, Suvanjan; Bashir, Abubakar Idris

doi:10.1016/j.applthermaleng.2020.115696

Cited by 28 publications

(8 citation statements)

References 44 publications

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“…Due to the magnetic dipole, the assumed liquid flow is affected by the magnetic field, whose magnetic scalar potential is given by (Everts et al, 2020):…”

Section: Mathematical Formulationmentioning

confidence: 99%

Numerical Simulation of Magnetic Dipole Flow Over a Stretching Sheet in the Presence of Non-Uniform Heat Source/Sink

2021

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The main objective of current communication is to present a mathematical model and numerical simulation for momentum and heat transference characteristics of Maxwell nanofluid flow over a stretching sheet. Further, magnetic dipole, non-uniform heat source/sink, and chemical reaction effects are considered. By using well-known similarity transformation, formulated flow equations are modelled into OD equations. Numerical solutions of the governing flow equations are attained by utilizing the shooting method consolidated with the fourth-order Runge-Kutta with shooting system. Graphical results are deliberated and scrutinized for the consequence of different parameters on fluid characteristics. Results reveal that the temperature profile accelerates for diverse values of space dependent parameter, but it shows opposite behaviour for escalated integrity of temperature dependent parameter.

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“…Due to the magnetic dipole, the assumed liquid flow is affected by the magnetic field, whose magnetic scalar potential is given by (Everts et al, 2020):…”

Section: Mathematical Formulationmentioning

confidence: 99%

Numerical Simulation of Magnetic Dipole Flow Over a Stretching Sheet in the Presence of Non-Uniform Heat Source/Sink

2021

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“…In any case, there are no cases where the flow is laminar. For this reason, according to a study in the literature [55,56], the effect of natural convection was not considered since it becomes relevant and comparable with a forced one, for Reynolds up to 600.…”

Section: Parameters Of the Optimization And Operative Conditionsmentioning

confidence: 99%

The Optimization of the Thermal Performances of an Earth to Air Heat Exchanger for an Air Conditioning System: A Numerical Study

Greco

Masselli

2020

Energies

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The aim of this paper is to research the parameters that optimize the thermal performances of a horizontal single-duct Earth to Air Heat eXchanger (EAHX). In this analysis, the EAHX is intended to be installed in the city of Naples (Italy). The study is conducted by varying the most crucial parameters influencing the heat exchange between the air flowing in the duct and the ground. The effect of the geometrical characteristics of the duct (pipe length, diameter, burial depth), and the thermal and flow parameter of humid air (inlet temperature and velocity) has been studied in order to optimize the operation of this geothermal system. The results reveal that the thermal performance increases with length until the saturation distance is reached. Moreover, if the pipe is designed with smaller diameters and slower air flows, if other conditions remain equal, the outlet temperatures come closer to the ground temperature. The combination that optimizes the performance of the system, carried out by forcing the EAHX with the design conditions for cooling and heating, is: D = 0.1 m s−1; v = 1.5 m s−1; L = 50 m. This solution could also be extended to horizontal multi-tube EAHX systems.

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“…In recent years, research on water wall stabilization and heat transfer characteristics of supercritical boilers has received extensive attention. [13][14][15][16][17][18][19][20][21][22] Li et al 23 conducted an experimental study on water wall tube heat transfer under high-temperature ash accumulation conditions and obtained the burnout time of the water wall without pressure relief. Wang and Xiao 24 obtained the temperature-time curve of the working fluid under electricity failure on the basis of assuming a constant exhaust velocity for the working fluid.…”

Section: Introductionmentioning

confidence: 99%

Experimental study and safety analysis on the heating surfaces in the 660 MW supercritical CFB boiler under sudden electricity failure

Xie

et al. 2022

Energy Science & Engineering

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The necessity of equipping with an emergency water supply system in a supercritical circulating fluidized bed (CFB) boiler has long been a controversial topic in the industry. In this study, the heating surface of a 660 MW supercritical CFB boiler at the Pingshuo Power Station of China Coal Group is taken as the research object. And a boiler electricity failure experiment was accomplished at the power plant, and the variations of thermal parameters during electricity failure were obtained from power plant distributed control system. By analyzing the physical process of the heating surfaces during electricity failure, a mathematical model of heat transfer to the heating surface was established and a calculation program in Fortran language was developed. In this study, the effect of different flow rates and operating times of the supply pumps on the safety of the heating surfaces were then investigated. The numerical simulation results show that an emergency supply pump with a flow rate of 250 t/h, activated within 120 s, ensures the safety of the heating surface. The results of this study have important implications for the selection of emergency supply pumps and the determination of flow rates and pressures for supercritical CFB boilers with external beds.

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Heat transfer characteristics of assisting and opposing laminar flow through a vertical circular tube at low Reynolds numbers

Cited by 28 publications

References 44 publications

Numerical Simulation of Magnetic Dipole Flow Over a Stretching Sheet in the Presence of Non-Uniform Heat Source/Sink

Numerical Simulation of Magnetic Dipole Flow Over a Stretching Sheet in the Presence of Non-Uniform Heat Source/Sink

The Optimization of the Thermal Performances of an Earth to Air Heat Exchanger for an Air Conditioning System: A Numerical Study

Experimental study and safety analysis on the heating surfaces in the 660 MW supercritical CFB boiler under sudden electricity failure

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