The flow field or multidimensional velocity distribution of the coolant in fuel rod bundles reactor core pressurized water reactors (PWRs) is an important parameter that revealed through experimental investigations. This paper presents two-dimensional (2D) profile measurement using a two-element ultrasonic transducer with both elements acting as transceiver. size minimized for compactness, lead...

the steps taken in designing a loop reactor for bulk propylene polymerization are discussed. the roles played by several parameters like particle growth factor, catalyst activity and solid fraction on reactor volume at different operating conditions are investigated. at first, based on a fixed production capacity and specific rate of catalyst, reactor volume is determined. next, the length and ...

Ultrasound as an advanced oxidation process (AOP) has been shown to effectively destruct organic and inorganic contaminants in aqueous solution [1]. In the sonicated solution, collapse of cavitation bubbles generates localized "hot spots" where temperature and pressure are as high as 5,000 K and 1,000 atm, respectively [2]. In this extreme condition, thermolysis and OH oxidation are two mechani...

development of ultrasound technique has not been progressing for evaluating the internal quality of fruits as fast as that of processed foods. in this research for quality assessment of pear fruit (shah miveh variety) an ultrasonic measurement system was constructed to transmit and receive the ultrasonic waves. the apparatus included a pulser-receiver, a pair of 75 khz ultrasonic transducers wi...

using ultrasonic devices in endodontics can enhance the antibacterial and tissue dissolving ability of different root canal irrigants such as sodium hypochlorite (naocl) which is the most common irrigant with excellent antibacterial and tissue dissolving abilities. however, due to its high surface tension, its penetration into the irregularities of the root canal system is a challenge. the purp...

Traditional high-voltage reactor monitoring and diagnosis research has problems such as high sampling demand, difficulty in noise reduction on site, many false alarms, lack of on-site data. In order to solve the above problems, this paper proposes an acoustic–electric fusion acquisition system defect method based pulse current ultrasonic detection signal. Using envelope peak signal basic data, ...

Abstract. Dry reforming of methane (DRM) is a trendy topic investigation as means reducing global warming. However, the adoption DRM for commercial purpose still question due to deactivation and sintering catalysts. The performance 5Ni/KCC-1 catalyst by using ultrasonic-assisted impregnation method was examined in this study. micro-emulsion were used prepare KCC-1 support respectively. characte...

Reactor Pressure Vessel (RPV) is classified as a safety related component and continued operation of the NPP for an additional fuel cycle is contingent upon the Nuclear Regulator approving the in-service inspection (ISI) performance. In accordance with applicable Finish regulative the integrity of cladding material on reactor pressure vessel is part of the interest and has to be included in exa...

Both the spectrum and correlation characteristics are important in constructing excitation sequences to realize the multichannel ultrasonic sensors working together. For LFM excitation sequence, there should not be too many simultaneously fired ultrasonic sensors, because of the limited available frequency band of the ultrasonic ranging system. The optimized CFM excitation sequences are propose...

In ultrasonic tube hydroforming, the tube is hydro formed while the ultrasonic vibration is applied to the die. Prior studies provide experimental proof that ultrasonic tube hydroforming reduces corner radius, improves lubrication and uniform thickness. Use of ultrasonic vibration can decrease friction at the tube-die interface. Few attempts have been made to analyze the wire drawing while the ...