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Articles 241 - 246 of 246
Full-Text Articles in Nuclear Engineering
การตรวจสอบความหนาของท่อไอน้ำด้วยวิธีถ่ายภาพด้วยรังสีเอกซ์โดยใช้แผ่นรับภาพดิจิทัล, ณัฐธิดา สุขใส
การตรวจสอบความหนาของท่อไอน้ำด้วยวิธีถ่ายภาพด้วยรังสีเอกซ์โดยใช้แผ่นรับภาพดิจิทัล, ณัฐธิดา สุขใส
Chulalongkorn University Theses and Dissertations (Chula ETD)
งานวิจัยนี้มีวัตถุประสงค์เพื่อพัฒนาเทคนิคการตรวจสอบความหนาของท่อไอน้ำที่อยู่ภายใต้ฉนวนด้วยเครื่องกำเนิดรังสีเอกซ์แบบเคลื่อนที่และแผ่นรับภาพดิจิทัล เนื่องจากโดยทั่วไปแล้วท่อไอน้ำของโรงไฟฟ้าถ่านหินจะมีลักษณะเป็นท่อเรียงติดกันเหมือนกำแพงสูง การกำหนดให้แหล่งกำเนิดรังสีอยู่กึ่งกลางของแผ่นรับภาพได้พอดีนั้นทำได้ยาก งานวิจัยชิ้นนี้จึงใช้เทคนิคการส่งผ่านของรังสีแกมมา คือ Cs-137 ความแรง 200 µCi ร่วมกับอุปกรณ์นับวัดแบบช่องเดี่ยว (Single Channel Analyzers;SCA) สแกนหาตำแหน่งที่มีค่านับวัดรังสีสูงสุด จากนั้นถ่ายภาพท่อไอน้ำด้วยเครื่องกำเนิดรังสีเอกซ์แบบเครื่อนที่รุ่น XRS3 ความต่างศักย์ 270 kV ร่วมกับแผ่นรับภาพดิจิทัลรุ่น VXTD-3643FCWV ถ่ายภาพท่อไอน้ำที่ทราบความหนาเทียบกับท่อไอน้ำที่ต้องการตรวจสอบ โดยการนำภาพถ่ายรังสีมาอ่านเป็นค่าความสว่างด้วยโปรแกรม ImageJ และเปรียบเทียบด้วยวิธีคลื่นเสียงความถี่สูง ผลการวิจัยพบว่าสามารถหาตำแหน่งกึ่งกลางของแหล่งกำเนิดรังสีได้อย่างแม่นยำ ขอบเขตของภาพที่เอกซ์โพเซอร์ 90 และ 99 พัลส์ ให้พื้นที่ 18.38 × 18.38 ตารางเซนติเมตร ผู้วิจัยจึงเลือกใช้เอกซ์โพเซอร์ที่ 90 พัลส์ ในการถ่ายภาพด้วยรังสี เนื่องจากสามารถถนอมอายุการใช้งานของเครื่องเอกซเรย์ได้มากกว่า และในการหาความหนาของท่อไอน้ำมีความคลาดเคลื่อนเฉลี่ย 0.92 mm จากการเปรียบเทียบกับความหนาจริงของท่อไอน้ำ
Utilization Of Plasma Technology For De-Inking And Hydrogenation Without Catalyst, Ika Priyanti
Utilization Of Plasma Technology For De-Inking And Hydrogenation Without Catalyst, Ika Priyanti
Chulalongkorn University Theses and Dissertations (Chula ETD)
Catalyst-free plasma technologies have been successfully utilized for de-inked and hydrogenated processes. These green methods have nonchemical contributions, operating at room temperature and atmospheric pressure, reducing the environmental impact of the process. Two plasma types and arrangements were studied in this research: corona plasma (de-inking) and dielectric barrier discharge plasma (hydrogenation). The results found that the deinkability factors were 48.58% (yellow printed paper), 64.11% (blue printed paper), and 41.11% (red printed paper) without altering the physical properties of the paper itself. The change in the tensile strength for the plasma-exposed paper was relatively little, less than 10%, compared to that …
Removal Of Perfluorooctanoic Acid (Pfoa) In Water With Dbd-Plasma-Enhanced Adsorbent, Thera Sahara
Removal Of Perfluorooctanoic Acid (Pfoa) In Water With Dbd-Plasma-Enhanced Adsorbent, Thera Sahara
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study examined the enhancement of PFOA removal from water using DBD plasma-modified adsorbents, specifically rice husks (RHs) and granular activated carbon (GAC). RHs treated with He-O2 plasma after phosphoric acid activation demonstrated a significant increase in adsorption efficiency, improving from 46.4% to 92.0% under optimal conditions. Adjusting pH to 4 further increased efficiency to 96.7%. The adsorption process followed the Langmuir model and pseudo-second-order kinetics, with a maximum capacity of 565 mg/g. The effects of DBD plasma on GAC in the presence of natural organic matter (NOM) were also assessed. Optimal plasma treatment enhanced PFOA removal in both deionized …
Cfd Analysis For Beyond Bubbly Gas-Liquid Two-Phase Flows In A Large Diameter Pipe, Sungje Hong
Cfd Analysis For Beyond Bubbly Gas-Liquid Two-Phase Flows In A Large Diameter Pipe, Sungje Hong
Doctoral Dissertations
"Due to the complexity of multiphase flow phenomena, numerical analysis for multiphase turbulent flow is not as reliable as single-phase computational fluid dynamics (CFD). A literature review has revealed that the current efforts on multiphase flow simulation have focused on small diameter channels under very restricted flow conditions and have been conducted without identifying some important procedures. To expand CFD applications to a wide range of two-phase flow conditions in large diameter channels, this study aims to validate the current CFD models for vertical concurrent air-water two-phase flow simulations beyond bubbly flows. First, a numerical model developed to describe dynamical …
3d Cfd Simulation Of A Bubble Column With Internals: Validation Of Interfacial Forces And Internal Effects For Local Gas Holdup Predictions, Hayder Al-Naseri, Joshua P. Schlegel, Muthanna H. Al-Dahhan
3d Cfd Simulation Of A Bubble Column With Internals: Validation Of Interfacial Forces And Internal Effects For Local Gas Holdup Predictions, Hayder Al-Naseri, Joshua P. Schlegel, Muthanna H. Al-Dahhan
Nuclear Engineering and Radiation Science Faculty Research & Creative Works
CFD Models (Turbulent Models and Interfacial Forces) Incorporated with the Population Balance Model (PBM) Have Been Validated, Azimuthally, with the Gamma-Ray-Computed Tomography (CT) Results to Address the Effect of the Presence of Internals with Different Arrangements and Diameters. the Superficial Gas Velocity Applied Was Varied from 0.05 to 0.45 M/s. the Results Exhibit the Capability to Predict the Hydrodynamics of the Bubble Column, Further Incorporating the Population Balance Model and Promoting the Prediction of Simulation in High Superficial Gas Velocity. the Effect of Internals Revealed that the Gas Holdup Was Significantly Enhanced in the Bubble Column's Wall Region, While the …
Small Modular Reactors, Joshua P. Schlegel, P. K. Bhowmik
Small Modular Reactors, Joshua P. Schlegel, P. K. Bhowmik
Nuclear Engineering and Radiation Science Faculty Research & Creative Works
Small Modular Reactors (SMRs) have been a very promising development in nuclear power over the last two decades. SMRs are defined as nuclear reactors with a power output of less than 300MWe. This is in comparison to gigawatt-size reactors, which can have electrical output of 1000–1500MWe or more. This chapter will consist of two major sections. the first will be a detailed summary of the small modular reactor designs being proposed around the world. This section will focus on those that are the furthest along in their development but will also include some information about the wide variety of proposed …