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Title: | 水球體與水二聚體微波加熱之極化電荷屏蔽效應與共振現象 Effects of Polarization Charge Shielding and Resonance in Microwave Heating of Water Sphere and Dimer |
Authors: | 梁如青 Ju-Ching Liang |
Advisor: | 朱國瑞 Kwo-Ray Chu |
Keyword: | 介電質微波加熱,極化電荷屏蔽效應,微波共振,介電質球狀共振腔,平面波,間隙電場強化作用, Microwave dielectric heating,Polarization charge shielding effect,Microwave resonance,Dielectric spherical resonator,Plane wave,Gap electric field enhancement, |
Publication Year : | 2023 |
Degree: | 碩士 |
Abstract: | 介電質微波加熱是多年來常見的科學研究議題,也被廣泛應用在工業領域,又以水為最具代表性的介電質材料之一。其中,微波加熱的速率和介電質內部電場強度有高相關性。然而,影響介電質內部電場分布的物理成因卻較少被研究。本論文著重探討兩個主要的成因:共振與極化電荷屏蔽效應,以及在水球體和水二聚體中,兩者如何交互作用以影響電場分布。其中,本論文主要以數學解析解分析水單球體的電場,並以文獻回顧探討水二聚體內部及間隙電場。本論文指出,對於水單球體而言,介電質內部電場強度及分布隨球體尺寸改變而有所不同。共振效應只在球體尺寸與電磁波波長相近時有顯著影響,而極化電荷屏蔽效應則廣泛存在於不同尺寸的球體中。對於水二聚體而言,間隙之電場因間隙兩側的極化電荷互相影響而顯著增強,但共振效應仍獨立存在於兩個球體內部。本論文對介電質球體在微波中的物理機制有基本理解,亦可呼應其他文獻的研究結果。 Microwave dielectric heating has long been a topic of scientific researches and a technique in industrial applications, with water being one of the most representative materials. It is also well known that the microwave heating rate has a high dependency on the electric field strength inside the dielectric. However, the physical origins determining the interior electric field pattern have not been studied as much. This thesis focuses on two primary effects, resonance and polarization charge shielding effect, as well as how they interact to form the interior electric field of a water sphere and dimer. In this thesis, analytical analysis is used to analyze the field profiles for single water sphere, while literature review is the main research method for water dimer. For single water sphere, it is shown that the electric field strength and uniformity is highly dependent on the dimension of the sample. The resonant effect is only significant when the dimension of the object is of the same order as the wavelength, whereas the polarization charge shielding effect can be observed in a wider size range. For water dimers, the gap field is significantly enhanced by polarization charges from gap-sides of both spheres, whereas the resonance in each sphere is independent from each other. This thesis gives basical understanding to the behavior of dielectric spheres under microwaves, and is consistent with the results from further researches. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/87762 |
DOI: | 10.6342/NTU202300933 |
Fulltext Rights: | 同意授權(全球公開) |
Appears in Collections: | 物理學系 |
Files in This Item:
File | Size | Format | |
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ntu-111-2.pdf | 4.12 MB | Adobe PDF | View/Open |
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