Experiment for validation of numerical models of coupled heat and mass transfer around energy cables

A special cyber-physical system is developed to control transient heat and mass transfer during the commissioning of the unified oil production complex consisted of oil reservoir, producing well equipped with electric submersible centrifugal pump, well production tree and ground-based control station. Two main elements of cyber-physical system are following: – computer simulator of heat and mass transfer in virtual oil production complex based on mathematical and numerical models of such processes along with simultaneous visualization of computational results; – portable imitation hardware of real ground-based equipment which is realized as 3D-printed plastic model consisted of control elements (pipeline valves, drossel chamber, ground-based control station) and recording devices (manometers, level indicator, liquid sampler and control station itself). Mechanisms of these elements are replaced by Arduino microchips to simulate the operation of real devices. An important feature of the cyber-physical system is the data exchange and interaction between oil production computer simulator and microcontroller software. Data transfer is going through the COM-ports of computer and microcontroller. The simulator sends calculated working characteristics of oil production complex to the memory of microcontroller, which not only analyzes incoming data but also displays it on the recording devices and forms necessary control parameters, which are sent back to simulator and affect the further behavior of the whole complex. Different elements of the CPS provides the possibility to control and visualize the commissioning of the oil production complex under consideration and the whole system is oriented to simulate the real technological actions performing by specialists in oil production.

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Numerical models to simulate heat and mass transfer at sharp interfaces in nucleate boiling

Numerical Heat Transfer Part A Applications ◽

10.1080/10407782.2018.1543918 ◽

2018 ◽

Vol 74 (10) ◽

pp. 1583-1610 ◽

Cited By ~ 1

Author(s):

Isaac Perez-Raya ◽

Satish G. Kandlikar

Keyword(s):

Mass Transfer ◽

Heat And Mass Transfer ◽

Numerical Models ◽

Nucleate Boiling ◽

Sharp Interfaces

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Numerical Simulation for Falling Film Thickness around Horizontal Tube in MVC and MED Evaporators

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1008.139 ◽

2020 ◽

Vol 1008 ◽

pp. 139-150

Author(s):

Alaa A. Ibrahim ◽

Hassan E.S. Fath ◽

Mona G. Ibrahim

Keyword(s):

Mass Transfer ◽

Film Thickness ◽

Heat And Mass Transfer ◽

Numerical Study ◽

Numerical Models ◽

Thickness Distribution ◽

Horizontal Tube ◽

Falling Film ◽

Ansys Fluent ◽

Intertube Space

Falling film on horizontal tube evaporators, of both Mechanical Vapor Compression (MVC) and the Multi-Effect Distillation (MED) desalination systems, plays an important role in the heat and mass transfer (evaporation) and accordingly the systems productivity. Falling film thickness is mainly influenced by the intertube space, circumferential angle and the film’s Reynolds number. This paper presents two-dimensional numerical study of falling film thickness around horizontal tube in MVC and MED evaporators. The study is based on computational fluid dynamics (CFD) using volume of fraction (VOF) as a multi-phase technique in ANSYS Fluent. The numerical model is developed in order to study the heat and mass transfer charactristics, the liquid falling film behaviour and thickness distribution around circular horizontal. Four CFD study cases are developed to simulate the falling film behaviour at circumferential angle range from 150 to 1650 with inter-tube spacing of 10 mm, 16 mm, 33 mm and 40 mm and for constant value of flow rate and at the same surrounding conditions. Simulations are conducted using a domain of only two tubes with 20 mm outer diameter.The results from the numerical models are compared with the published experimental correlations, showing a comparatively reasonable agreement. In addition, a parametric study is carried out to illustrate the effect of flow Reyonlds number (Re) and intertube space on the average circumferential film thickness and heat transfer rates.

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