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沸騰現象及其曲線特性

今日出廠產品展示及部分報價

1、 沸騰現象及其曲線特性
1, the boiling phenomenon and its characteristics
加熱器沸騰現象的實驗裝置,在這個裝置中,若經熱流密度控制器控制,對加熱器施加較低的功率時,加熱器產生較低的熱流密度,經一段時間后,在液面可以看到有蒸汽產生,而當熱流密度控制器對加熱器施加較大功率時,液面上除看到產生的蒸汽外,加熱器的表面會產生氣泡,這些氣泡在脫離加熱器表面層浸入液體并上升,上升過程中氣泡體積也將進一步發生變法,這種伴隨氣泡生產的過程稱為沸騰或氣泡的生成
The experimental device of heater boiling phenomenon, in this system, if the heat flux controller, applied to low power of heater, heater to generate heat flux density low, after a period of time, can be seen in the liquid level of steam is generated, and when the heat flux controller applied to large power heater, liquid level in addition to see the steam, the heater surface will produce bubbles, the bubbles and rise from the heater surface layer is dipped into the liquid, the bubble volume will also further political reform in the rising process, which is called the bubble with boiling or bubble production generation
在分析問題時,我們先說明一個專用名詞,過于溫度。
In analyzing the problem, we first illustrate a specific term, over temperature.
所謂過余溫度,就是加熱器表面溫度與液體的沸點溫度之差值。過余溫度的大小對研究沸騰及電熱元件的使用有極其重要的現實意義。
The so-called excess temperature, is the temperature and the boiling point of the liquid heater surface temperature difference. Has the extremely important practical significance to use excess temperature of boiling and the size of the heating element.
容器沸騰的曲線特征圖區域劃分圖
Figure area partition curve containers of boiling
在以上曲線圖示中,已經將容器底部加熱的液體沸騰狀態過程圖全部描述出來了現開始對每一區域特征作文字性的說明及解釋:
In the above diagram, the bottom of the container is heated in boiling liquid state of all description out now on each region characteristic word of description and explanation:
首先對I區的自然對流現象作定性描述:自然對流的產生本質是流體因密度變法而產生的浮力作用而運動的,因此,當底部輸入的微小功率作用于發熱元件而產生的微熱而導致底部界面液體的密度而減小所產生的一種自然對流的導熱現象,這是一種宏觀無法直覺的過度狀態。
First, natural convection in the I area of the phenomenon of qualitative description: produce the essence of natural convection is due to buoyancy fluid density method of motion, therefore, density and decrease is the result of a natural convection heat conduction phenomenon when the small power input to the bottom of the heating element and the heat caused the bottom the interface of liquid, which is a kind of excessive state macro cannot intuition.
II區:當底部加熱元件的輸入功率產生的熱量導致界面液相轉化后的氣相(氣泡)在上升過程中合聚并快速上升致自由表面,并形成宏觀上的氣泡柱。
II: input power when the bottom heating elements heat generation resulting in interfacial liquid phase transformation after the gas phase (bubble) in the rising process together and quickly rise to the free surface, and the formation of bubble column on macroscopic.
IV區:當底部加熱元件面與液體結合的界面完全被氣泡所隔絕,形成的氣膜使得熱阻加大,減小了加熱元件與液體的熱交換速率,這種氣泡的出線,相對于加熱元件的熱擴散過程來說,無疑是熱阻增加的一種事實存在。在此過程中,傳遞速率隨過余溫度的增加而減小,而且在這過程中還存在脈動現象:由于氣膜的破裂和重新出現是隨機,所以此過程也是一個很不穩定的工程。
IV: when combined with the bottom heating element surface and the liquid interface was completely cut off gas bubbles, film forming the resistance increase, reduce the heating element and liquid heat exchange rate, outlet this bubble, with respect to the thermal diffusion process heating element, is a fact that there is thermal resistance increase. In this process, increase the transfer rate increases as the excess temperature and reduced, but also the existence of pulsation phenomena in this process: due to the rupture of gas film and re appear to be random, so this process is a very unstable engineering.
V區:當加熱元件表面上的氣膜變得穩定是,即△T達到約400℃時,輻射傳熱現象并主導著傳熱的方式。所以,此時的熱流密度再次隨△T之增大而增大。
V area: when the heating element on the surface of the film becomes stable, namely the △ T at about 400 ℃, radiation heat transfer phenomena and dominate the heat transfer method. Therefore, heat flux density at this time again with △ T increased.
VI區:在此時,加熱面的傳熱方式主要由輻射方式來完成或者輻射方式的傳熱占總傳熱量的絕大對數。
VI: at this time, the heat transfer heat transfer by radiation heating surface to complete or radiation mode of total heat transfer the vast majority of the number of.

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女人阴性道图片真人18