臺灣博碩士論文加值系統

隨著社會與生活型態的日新月異，因此人類的飲食習慣與生活作息也有所改變，但這同時對身體的器官造成相當大的負擔，也使得病變越來越多樣化，人類為了改善這些病狀，研發出人工心血管器官。但心血管中會造成非生理性的流況，其流況所產生的血流應力會引發血液的破壞，特別是紅血球的損傷，稱為溶血。真實流場應包含有剪應力和拉伸應力，許多學者在爭論切應力和拉伸應力何者才是主導溶血的主要因素，於是產生了一個指標也就是能量消散率，這個指標無忽略上述兩種力，本研究以斜角模型與直角模型做為實驗流場，探討這三種力何者才是主導溶血主要因素，此流場先經由CFD的計算，求出其應力值，然後採用豬的新鮮紅血球，進行溶血的測試，發現切應力與能量消散率無法成為主導溶血的主要依據，而拉伸應力才是主導血球破壞的主導血球破壞的機械力，其閥值約為800 Pa。

With newer and newer society and life style, the diet and living habits of people are also changing, but they make a great burden to organs in our body simultaneously. They also make more pathological changes. Therefore, humans develop artificial organs of cardiovascular to improve these symptoms.
However, there is irrational flow conditions in cardiovascular system. What’s more, flow conditions will cause stress and destroy blood, especially in destruction of red blood cell, which is called hemolysis. Real flow field should include shear stress and extensional stress. Many scholars argue that which one is the main hemolysis factor, so they use Energy Dissipation Rates as an indicator. Energy Dissipation Rates don’t disregard foregoing two stress. This research apply bevel model and right Angle model to be a experimental flow field, discussing which one is the main hemolysis factor. Flow field is calculated by CFD and get stress of threshold. Then, I use pig’s fresh red blood cell to test hemolysis. I find that Shear stress and Energy Dissipation Rates can’t be the main factor in hemolysis. Nevertheless, according to 800 Pa threshold value, I find that extensional stress can destroy blood cells, and it is also the main factor.

目錄
表目錄 VI
圖目錄 VII
第一章 緒論 1
1-１ 前言 1
1-2 研究目的與動機 3
1-3 研究過程 5
第二章 文獻回顧 8
2-1 血球破壞閥值 8
第三章 實驗設置 16
3-1 CFD數值方法設定與模式模擬 16
3-2 模型概況 22
3-3溶血實驗 流場設置 24
3-3紅血球破壞實驗 25
第四章 結果與討論 29
4-1 流場模擬速度分布 29
4-2流場上應力分布之探討 52
4-3斜角流場與直角流場分布之探討 53
4-3-1 速度分布比較 53
4-3-2 τ_xx分布比較 54
4-3-3 τ_yy分布比較 55
4-3-4 τ_xy分布比較 56
4-3-5切應力(Shear stress)分布比較 57
4-3-6拉伸應力(Extensional stress)分布比較 58
4-3-7能量消散率(Energy Dissipation Rates)分布比較 59
4-4 流量權重法 60
4-4-1 溶血結果 64
4-4-2速度與溶血指數IH之關係 65
4-4-3六分量的應力與溶血指數IH之關係 66
4-4-6 切應力(Shear stress)、拉伸應力(Extensional stress)、能量消散率(EDR)與溶血指數IH之關係 73
4-5 建議與改進 77
第五章 結論 78
參考文獻 79
表目錄
表2-1.研究學者列表。 9
表3-1.各參數對照表。 21
表3-2.此為流場初始條件設計之依據，初始平均流速與Re數的數值。 21
表4-1.各段面能量消散率(Energy Dissipation Rates)的平均數值。 61
表4-2.流量權重法所得之流場應力值。 63
表4-3.17cP溶血與對應之狹縫平均流速。 64
圖目錄
圖 2-1.斜角與直角流場示意圖(a)斜角流場示意圖(b)直角流場示意圖。 15
圖 3-1.斜角流場模擬圖(單位皆為mm，Z(厚度)=0.5mm) 20
圖 3-2.直角流場模擬圖(單位皆為mm，Z(厚度)= 0.5mm) 20
圖3-3.斜角鋼板(單位為mm) 22
圖3-4.直角鋼板(單位為mm) 22
圖3-5.斜角模型圖 23
圖3-6.斜角模型圖 23
圖3-7.流場設置圖 27
圖3-8.實驗樣本 27
圖3-9.馬達控制器(a)與伺服馬達(b)的實體圖。 28
圖3-10.為流場設置實體圖。 28
圖4-1.黏滯度17cP，斜角橫切面xy軸平面上Velocity分布圖。 31
圖4-2.黏滯度17cP，斜角橫切面xy軸平面上τ_xx分布圖。 32
圖4-3.黏滯度17cP，斜角橫切面xy軸平面上τ_yy分布圖。 33
圖4-4.黏滯度17cP，斜角橫切面xy軸平面上τ_zz分布圖。 34
圖4-5.黏滯度17cP，斜角橫切面xy軸平面上τ_xy分布圖。 35
圖4-6.黏滯度17cP，斜角橫切面xy軸平面上τ_yz分布圖。 36
圖4-7.黏滯度17cP，斜角橫切面xy軸平面上τ_zx分布圖。 37
圖4-8.黏滯度17cP，斜角橫切面xy軸平面上Shear-stress分布圖。 38
圖4-9.黏滯度17cP，斜角橫切面xy軸平面上Extensional-stress分布圖。 39
圖4-10.黏滯度17cP，斜角橫切面xy軸平面上Energy Dissipation Rates分布圖。 40
圖4-11.黏滯度17cP，直角橫切面xy軸平面上Velocity分布圖。 42
圖4-12.黏滯度17cP，直角橫切面xy軸平面上τ_xx分布圖。 43
圖4-13.黏滯度17cP，直角橫切面xy軸平面上τ_yy分布圖。 44
圖4-14.黏滯度17cP，直角橫切面xy軸平面上τ_zz分布圖。 45
圖4-15.黏滯度17cP，直角橫切面xy軸平面上τ_xy分布圖。 46
圖4-16.黏滯度17cP，直角橫切面xy軸平面上τ_yz分布圖。 47
圖4-17.黏滯度17cP，直角橫切面xy軸平面上τ_zx分布圖。 48
圖4-18.黏滯度17cP，直角橫切面xy軸平面上Shear-stress分布圖。 49
圖4-19.黏滯度17cP，直角橫切面xy軸平面上Extensional-stress分布圖。 50
圖4-20.黏滯度17cP，直角橫切面xy軸平面上Energy Dissipation Rates分布圖。 51
圖4-21.速度分布比較。 53
圖4-22.τ_xx分布比較。 54
圖4-23〖.τ〗_yy分布比較。 55
圖4-24〖.τ〗_xy分布比較。 56
圖4-25.切應力(Shear stress)分布比較。 57
圖4-26.拉伸應力(Extensional stress)分布比較。 58
圖4-27.能量消散率(Energy Dissipation Rates)分布比較。 59
圖4-28.能量消散率(Energy Dissipation Rates)的各個段面。 61
圖4-29.17cP下Velocity與溶血之關係圖。 65
圖4-30.17cP下 τ_xx與溶血之關係圖。 66
圖4-31.17cP下 τ_yy與溶血之關係圖。 67
圖4-32.17cP下 τ_zz與溶血之關係圖。 68
圖4-33.17cP下 τ_xy與溶血之關係圖。 69
圖4-34.17cP下 τ_yz與溶血之關係圖。 70
圖4-35.17cP下 τ_zx與溶血之關係圖。 71
圖4-36.17cP下 Shear stress與溶血之關係圖。 73
圖4-37.17cP下拉伸應力(Extensional stress)與溶血之關係圖。 74
圖4-38.17cP下能量消散率(EDR)與溶血之關係圖。 75

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