Three-Dimensional Pipe Fouling Layer Estimation by Using Conjugate Gradient Inverse Method

Chen, Wen Lih; Yu, Yang; Lee, Haw Long

doi:10.1080/10407780902864722

Cited by 15 publications

(5 citation statements)

References 26 publications

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“…Use of this technique for the solution of 3-D boundary inverse heat conduction problems is well documented in the literature (e.g. [21,22,23,24,25]). The Alifanov Iterative Regularisation method is described in Section 1.4 in the context of this application.…”

Section: Inverse Solution Methodsmentioning

confidence: 99%

Inverse estimate of heat flux on a plasma discharge tube to steady-state conditions using thermocouple data and a radiation boundary condition

Faoite¹,

Browne²,

Gamboa³

et al. 2014

International Journal of Heat and Mass Transfer

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The heat flux incident upon the inner surface of a plasma discharge tube during a helicon plasma discharge was estimated using an inverse method. Temperature readings were taken from the outer surface of the tube using thermocouples, and the temperature data were interpolated over the tube surface. A numerical inverse procedure based on the Alifanov iterative regularisation method was used to reconstruct the heat flux on the tube inner surface as a function of space and time. In contrast to previously-used inverse models for this application, the current model implements a thermal radiation boundary condition to realistically model the energy exchange in the device. Additionally in these experiments, steady-state operation was reached, and the accurate modelling of the steady-state condition was facilitated by the thermal radiation boundary condition. The variation of heat flux with helicon discharge power, propellant flowrate, and electromagnet current was studied, and it was found that the waste heat flux increased with applied RF power and propellant flowrate, and decreased with current supplied to the electromagnets, over the range of parameter variation tested.

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Section: Inverse Solution Methodsmentioning

confidence: 99%

Inverse estimate of heat flux on a plasma discharge tube to steady-state conditions using thermocouple data and a radiation boundary condition

Faoite¹,

Browne²,

Gamboa³

et al. 2014

International Journal of Heat and Mass Transfer

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“…Among the different studies about inverse heat transfer approach in pipes we can find different geometrical schematization of the physical problem, i.e. 0D [18], 1D [17], 2D [14,15], 2D-axialsymmetric [19], 3D [16] and both stationary [15][16][17] and transient studies [14,18,19].…”

Section: Introductionmentioning

confidence: 99%

Estimation of the local instantaneous heat flux inside a pulsating heat pipe for space applications

Cattani

Pagliarini

Bozzoli

et al. 2023

J. Phys.: Conf. Ser.

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Pulsating Heat Pipes (PHP) are promising and effective passive two-phase heat transfer devices in terms of high heat transfer capability, efficient thermal control, adaptability and low cost and therefore they have been extensively studied in the last years. Many authors have estimated the heat fluxes at the evaporator and at the condenser area only in terms of the average values based on first principle considerations. In the present study the application of an inverse analysis technique to experimental infrared temperature data is proposed to investigate the local convective heat flux for forced convection flow inside these devices along the adiabatic zone. A PHP specifically designed to be hosted on board the heat transfer host of the International Space Station was tested in microgravity during the 67th Parabolic Flight Campaign organized by the European Space Agency. The device consists of an aluminium tube closed in a loop with 14 turns in the evaporator section, 3 mm inner diameter, half filled with FC-72 fluid. The external temperatures of the device are measured in the adiabatic zone with a high-speed infrared camera (50 Hz, 1280x1024 pixels). The images are thereafter post-processed and adopted as input data for the solution of the inverse heat conduction problem in the pipe wall (Tikhonov regularisation method) to extrapolate time-varying local heat fluxes on the tube internal surface in contact with the fluid.

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“…To date, several studies have attempted to develop traditional fouling removal and descaling methods, including chemical cleaning, mechanical descaling, and high-pressure water injection [8][9][10][11]. Although these descaling processes can be highly effective, they have severe limitations and disadvantages [12][13][14]. Chemical methods are costly, time-consuming, and highly detrimental to the environment [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…Although these descaling processes can be highly effective, they have severe limitations and disadvantages [12][13][14]. Chemical methods are costly, time-consuming, and highly detrimental to the environment [12,13]. Mechanical descaling methods like pigging can seriously damage the pipeline and highpressure water injection like ushing is not suitable for pipes with a large diameter.…”

Section: Introductionmentioning

confidence: 99%

Improving the Descaling Rate of an In-situ Ultrasonic Fouling Removal Method for Industrial Water-filled Pipelines

Mohammadi,

Mobli,

Siahtiri

et al. 2023

Preprint

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Introducing innovative and environmentally friendly fouling removal methods for water-filled pipelines is essential nowadays to increase pipelines' safety and productivity and eliminate the limitations of traditional descaling methods. In this paper, we investigate the capability of high-power ultrasonic waves and cavitation phenomenon as an influential online fouling removal tool to remove the build-up fouling with a thickness of 1 mm on the inner surface of 4-inch low-carbon stainless steel pipes filled with water. First, we developed a FEM simulation to investigate the effect of ultrasonic power on the acoustic pressure at different distances from the transducer attached point on the pipe using Comsol Multiphysics. After that, we conducted an experimental and statistical investigation to validate our result from FEM analysis using a transducer set and PZT-4 piezoelectric attached to the pipes' outer surface. The results showed that increasing the transducer's electrical power would raise the fluid's acoustic pressure. Furthermore, we indicate that increasing the electrical power to 400 W results in a higher fouling removal rate in the pipe.

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Three-Dimensional Pipe Fouling Layer Estimation by Using Conjugate Gradient Inverse Method

Cited by 15 publications

References 26 publications

Inverse estimate of heat flux on a plasma discharge tube to steady-state conditions using thermocouple data and a radiation boundary condition

Inverse estimate of heat flux on a plasma discharge tube to steady-state conditions using thermocouple data and a radiation boundary condition

Estimation of the local instantaneous heat flux inside a pulsating heat pipe for space applications

Improving the Descaling Rate of an In-situ Ultrasonic Fouling Removal Method for Industrial Water-filled Pipelines

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