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Habiba Lais

Bio: Habiba Lais is an academic researcher from Brunel University London. The author has contributed to research in topics: Fouling & Ultrasonic sensor. The author has an hindex of 4, co-authored 8 publications receiving 61 citations.

Papers
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Journal ArticleDOI
TL;DR: Results show the potential of high power ultrasonics for fouling removal in pipe structures from the wave propagation across the structure under excitation, and are used to validate a COMSOL model to determine cleaning patterns based on pressure and displacement distributions for future transducer array design and optimization.

51 citations

Journal ArticleDOI
02 Jul 2018-Sensors
TL;DR: The findings demonstrate the potential to detect fouling build-up in lengthy pipes and to quantify its thickness by the reduction in amplitude found from further numerical investigation, and can be exploited to optimize the power ultrasonic fouling removal procedure.
Abstract: The accumulation of fouling within a structure is a well-known and costly problem across many industries. The build-up is dependent on the environmental conditions surrounding the fouled structure. Many attempts have been made to detect fouling accumulation in critical engineering structures and to optimize the application of power ultrasonic fouling removal procedures, i.e., flow monitoring, ultrasonic guided waves and thermal imaging. In recent years, the use of ultrasonic guided waves has been identified as a promising technology to detect fouling deposition/growth. This technology also has the capability to assess structural health; an added value to the industry. The use of ultrasonic guided waves for structural health monitoring is established but fouling detection using ultrasonic guided waves is still in its infancy. The present study focuses on the characterization of fouling detection using ultrasonic guided waves. A 6.2-m long 6-inch schedule 40 carbon steel pipe has been used to study the effect of (Calcite) fouling on ultrasonic guided wave propagation within the structure. Parameters considered include frequency selection, number of cycles and dispersion at incremental fouling thickness. According to the studied conditions, a 0.5 dB/m drop in signal amplitude occurs for a fouling deposition of 1 mm. The findings demonstrate the potential to detect fouling build-up in lengthy pipes and to quantify its thickness by the reduction in amplitude found from further numerical investigation. This variable can be exploited to optimize the power ultrasonic fouling removal procedure.

14 citations

Journal ArticleDOI
TL;DR: A previously experimentally-validated numerical model is used to conduct a parametric study in order to optimize the in-situ ultrasonic fouling removal technique on a 6 in.

13 citations

Journal ArticleDOI
03 Jun 2020-Sensors
TL;DR: According to the studied condition, 1.84 m of inspection coverage could be achieved at a single direction for pulse-echo, which could be improved by using a higher number of transducers for excitation and using pitch-catch configuration.
Abstract: The structural integrity assessment of thermoplastic pipes has become an interesting area of research due to its elevated usage in the liquid/gas transportation industry. Ultrasonic guided wave testing has gained higher attention from industry for the inspection of elongated structures due to the reduced inspection time and cost associated with conventional non-destructive testing techniques, e.g., ultrasonic testing, radiography, and visual inspection. Current research addresses the inspection of thermoplastic pipes using ultrasonic guided waves as a low cost and permanently installed structural health-monitoring tool. Laboratory and numerical investigations were conducted to study the potential of using ultrasonic guided waves to assess the structural health of thermoplastic pipe structures in order to define optimum frequency range for inspection, array design, and length of inspection. In order to achieve a better surface contact, flexible Macro-Fiber Composite transducers were used in this investigation, and the Teletest® Focus+ system was used as the pulser/receiver. Optimum frequency range of inspection was at 15−25 kHz due to the level of attenuation at higher frequencies and the larger dead zone at lower frequencies due to the pulse length. A minimum of 14 transducers around the circumference of a 3 inch pipe were required to suppress higher order flexural modes at 16 kHz. According to the studied condition, 1.84 m of inspection coverage could be achieved at a single direction for pulse-echo, which could be improved by using a higher number of transducers for excitation and using pitch-catch configuration.

10 citations

Proceedings ArticleDOI
01 Jun 2017
TL;DR: In this article, the use of high power ultrasonic transducers is proposed as a means to remove fouling on a structure whilst in operation, and the work presented in this paper consists of the designing of bespoke high power transducers, transducer array design and development of a bespoke power amplifiers to drive the high-power transducers.
Abstract: Fouling build up is a known problem in the industry. Accumulation of fouling can occur in different structures e.g. offshore pipes, ship hulls, floating production platforms. The type of fouling that is being accumulated is dependent on environmental conditions surrounding the structure itself. Current methods that are deployed for fouling removal spans over hydraulic, chemical and manual means. Current technologies such as DynaJet (cavitating water jets) and Hydrex's underwater ship hull cleaner have both advantages and disadvantages, where one common disadvantage is to put the operation of the structure to a halt in order to commence the fouling removal process. Currently, ultrasonic baths are used for cleaning by generating cavitation bubbles which implode on the surface of fouling, particularly in Reverse Osmosis applications. Conventionally, components that have accumulated fouling are placed into an ultrasonic bath which yet again, requires to stop the operation of the structure for fouling removal process to commence. Application of high power ultrasonic transducers are proposed in this work as a means to remove fouling on a structure whilst in operation. The work presented in this paper consists of the designing of bespoke high power transducers, transducer array design and development of bespoke power amplifiers to drive the high power transducers. The Polytec 3D Laser Doppler Vibrometer has been incorporated into this investigation to study the fouling removal process. Results shows the potential of using high power ultrasonic transducers for fouling removal in marine structures due to the wave propagation across the structure that is under excitation.

7 citations


Cited by
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Journal ArticleDOI
TL;DR: The current state of ultrasonic transducers of magnetostrictiv type and piezoelectric type as well as applications of power ultrasound in various industrial fields including chemical reactions, drying/dehydration, welding, extraction, heat transfer enhancement, de-ice, enhanced oil recovery, droplet atomization, cleaning and fine particle removal are presented.

121 citations

Journal ArticleDOI
TL;DR: In this paper, the authors present a comprehensive review and current insights into the use of high-pressure systems, specifically supercritical fluid extraction and pressurized liquid extraction assisted by ultrasound, as emerging technologies for extracting bioactive compounds from natural products.

39 citations

Journal ArticleDOI
TL;DR: This work plots the two bifurcation structures in tandem, the oscillatory behavior of the bubble was analyzed with more detail, and stable SuH and UH bubble oscillations were investigated.

37 citations

Journal ArticleDOI
26 Jan 2021-Sensors
TL;DR: In this paper, the authors reviewed the literature on UGWs, damage inspection, severity, temperature influence on the guided wave and parametric characteristics of the inspecting wave and concluded that no significant work had been done to correlate the parametric feature of GWUT with combined damage effect under varying conditions.
Abstract: Damage is an inevitable occurrence in metallic structures and when unchecked could result in a catastrophic breakdown of structural assets. Non-destructive evaluation (NDE) is adopted in industries for assessment and health inspection of structural assets. Prominent among the NDE techniques is guided wave ultrasonic testing (GWUT). This method is cost-effective and possesses an enormous capability for long-range inspection of corroded structures, detection of sundries of crack and other metallic damage structures at low frequency and energy attenuation. However, the parametric features of the GWUT are affected by structural and environmental operating conditions and result in masking damage signal. Most studies focused on identifying individual damage under varying conditions while combined damage phenomena can coexist in structure and hasten its deterioration. Hence, it is an impending task to study the effect of combined damage on a structure under varying conditions and correlate it with GWUT parametric features. In this respect, this work reviewed the literature on UGWs, damage inspection, severity, temperature influence on the guided wave and parametric characteristics of the inspecting wave. The review is limited to the piezoelectric transduction unit. It was keenly observed that no significant work had been done to correlate the parametric feature of GWUT with combined damage effect under varying conditions. It is therefore proposed to investigate this impending task.

36 citations