Pengaruh Rasio I/D terhadap Permulaan Flooding dan Fluktuasi Voltase Sinyal Tekanan Rezim Flooding pada Geometri Kompleks

Abstract

A nuclear power plant operation requires reliability safety systems. Therefore, an accidental scenario such as the LOCA becomes a specific attention. This relates to a countercurrent flow phenomenon which permits the occurrence of a flooding regime. This study aims to investigate the effets of I/D ratios of the riser on the onset of flooding and time-series voltage fluctuations of differential pressure signals of the flooding regime on a complex geometry representing a PWR hot leg. The test section contains a combination of a horizontal, an elbow and an inclined pipes. Three I/D ratios containing 1.9 (R1), 3.9 (R2) and 8.3 (R3) were assesed. The tabulated data are expressed in the term of a flooding curve. Meanwhile, the statistical features of the time-series voltage fluctuations of the signals are presented on both PDF and PSD graphs. The results obtained show that the assesed I/D ratios do not conduct significance effects on the onset of flooding. On the other hand, there are trends which can be obtained from the time-series signals with the increase of the I/D ratio. Those trends can also be observed in the such statistical features; the PDF and PSD graphs, respectively.

An experimental investigation on CCFL characteristics during gas/low surface tension liquid counter-current two-phase flow in a small-scaling PWR hot leg typical geometry

“…On the basis of experimental investigations, studies on the basis of visualizations have been largely introduced [2,[5][6][7][8] through detailed identifications of the obtained flow structures. Here, the mechanisms leading to flooding have been visually observed and supported by signal characterizations obtained by physical measurements such as pressures [9,10] as well as phasic fractions [11]. Subsequently, through these visual observations, CCFL has been largely reported to be characterized through a curve representing the phasic superficial velocity when the transition is initiated, well-known as CCFL characteristic curves.…”

“…The experiments were carried out during a research framework to investigate the characteristics of counter-current flow in a small-scale facility representing a down-scaled model of German-Konvoi PWR primary circuit [9][10][11][12]13,14]. The experiment apparatus, which is schematically depicted in Figure 1, has been particularly developed in the Laboratory of Fluid Mechanics and Heat Transfers of Universitas Gadjah Mada, Indonesia.…”

“…The experiment apparatus, which is schematically depicted in Figure 1, has been particularly developed in the Laboratory of Fluid Mechanics and Heat Transfers of Universitas Gadjah Mada, Indonesia. Details of construction of the facility, comprising the fluid supply and lighting systems, and also experimental procedures including the measurement techniques are described by previous reports [9][10][11][12]13]. Therefore, in the present reports only the test section is briefly explained in the following.…”

A Brief on Optical-based Investigation towards The Interfacial Behaviors during High Viscous Liquid / Gas Countercurrent Two-Phase Flow in a Complex Conduit Representing 1/30 Down-Scaled of PWR Hot Leg Geometry

“…Subsequently, measurement methods have also been developed to support the corresponding studies. Here, the studies on the pressure fluctuations were reported by several researches [7,8]. Furthermore, the development of measurement methods has been conducted through physical measurements and also measurements on the basis of optical data.…”

Pengaruh Jarak Nosel Udara Dengan Outlet Terhadap Dis-Tribusi Ukuran Bubble Yang Dihasilkan Oleh MBG Tipe Swirl

“…Eksperimental dilakukan untuk menghimpun data berupa hasil rekaman video microbubble dengan menggunakan kamera video kecepatan tinggi Phantom Miro M310 dan data penurunan tekanan pada inlet dan outlet MBG dengan menggunakan Pressure transduser merk Validyne P55D yang kemudian diolah untuk mengetahui performa MBG. Pengolahan data eksperimen berupa probabilitas distribusi ukuran bubble dilakukan dengan menggunakan image processing sedangkan pengolahan data pressure drop dilakukan melalui signal analysis dengan pendekatan statistik untuk mendapatkan hasil yang lebih terperinci [1].…”