https://scholars.lib.ntu.edu.tw/handle/123456789/80032
Title: | 液滴撞擊液體之聲能實驗初探 The basic experiment for droplet impact on liquid and produce sound |
Authors: | 施幸宏 SHIN-HUNG, SHIH |
Keywords: | 液滴;撞擊;液體;聲能;droplet;impact;liquid;sound | Issue Date: | 2005 | Abstract: | 本文主要是以實驗方式探討液滴撞擊液體的過程及其產生聲音的特性。實驗分為兩個主要系統,一是流場可視化系統:以高速照相機拍攝夜滴撞擊液體的過程,另一是聲音量測系統:以液中聽診器來量測液滴撞擊液體的聲音。 本文實驗分為三部份,第一個部份是不同直徑液滴以不同速度撞擊液體,觀察其撞擊型態。第二個部份是針對第一個部份實作結果,選擇一種不同特性之撞擊型態,分別量測其聲壓大小,大致可分為五種情形: 第一種情況是液滴撞擊液體後不產生氣泡、文獻上所謂Masler 區; 第二種情況是液滴撞擊液體後產生單一氣泡(此種情況又可細分為發生在規則性氣泡區、不規則性氣泡區及大氣泡區); 第三情況是液滴撞擊液體後分別產生兩次單一氣泡(此種情況發生在不規則性氣泡區及規則性氣泡與不規則性氣泡混合區)。 第四種情況是液滴撞擊液體後產生多顆小氣泡(此種情況發生在不規則性氣泡區)。 第五情況是液滴撞擊液體後於液體上產生包覆式氣膜;此種情況發生在不規則性氣泡區。 第三個部份是以五種不同直徑液滴,以不同撞擊高度做實測並與連續多顆液滴結果做比較。本文實驗結果發現:液滴直徑5.3mm至7.3mm作不同速度撞擊會先經過規則性氣泡區及規則性氣泡與不規則性氣泡混合區,最後才進入不規則性氣泡區。於聲音量測方體,初始撞擊聲壓隨撞擊高度增加而增加,撞擊聲音頻率除隨撞擊速度增加而增加外,另隨液滴直徑減少而增加。 The experiment is " droplet impact on liquid". that can product sound. so We have three part to do. First ; We use different droplet size and hight. that can impact on liquid and produce eight situation sound pressure. Second; We fix droplet diameter and variation high. That can compare sound pressure interrelated. Third; We use different droplet diameter and high that impact on liquid and to observe different phenomenon we get great conclusion. First; If we fix impact high. And to increase droplet diameter that can reduce sound frequency. Second; If we fix droplet diameter And to increase impact high that increase sound frequency. Third; We use different droplet diameter and impact high. We have a new find; The regular entrainment was occured.that is in droplet diameter from 5.7mm to 7.5mm and impact velocity 1.5m/s.The other one; We find, The droplet diameter is 10mm and the impact velocity is 1.4m/s then we can get large bubbles |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/62496 | Other Identifiers: | zh-TW |
Appears in Collections: | 應用力學研究所 |
File | Description | Size | Format | |
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ntu-94-R90543047-1.pdf | 23.53 kB | Adobe PDF | View/Open |
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