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Hydrodynamics and Hydraulic Transmission

為了解決Hydraulic的問題，作者Wang, Wang Xiufeng 這樣論述：

Xiufeng Wang, Beihang University, Beijing, China

Hydraulic進入發燒排行的影片

自動化倉儲撒水特性分析

為了解決Hydraulic的問題，作者陳躍仁 這樣論述：

台灣網路購物興盛，為能有效率配置大量商品，物流業使用自動倉儲來進行貨品存放，發生火災時，其延燒速度均十分迅速。在自動倉儲中，自動撒水設備可在火災時第一時間有效滅火並侷限火勢，在無人化的工作環境中是消防單位與保險公司認為較可靠的滅火設備。國內的自動撒水設備主要參考日本法規之規範，為了方便官方審核，法規規範僅限以手算方式設計撒水系統，法規規範過於簡略，對於倉儲內貨架型式、貨架排數及貨品分類等均無較細緻之規定，難以對應實務面之需求。現今中美各國已結合設計理念及法規開發出電腦模擬軟體進行水力計算，而國內則仍僅限手算，與各國已有明顯差異。本研究比較國內、中國GB及美國NFPA法規分析國內自動倉儲案例，

以最低撒水密度值來看，國內規範明顯較其他2國低估，建議國內法規應增加適合國內實務現況倉儲內貨架型式、貨架排數、貨品分類及儲貨高度等分類，再依照分類繪製防護空間撒水密度及撒水頭間距等對照圖表，以期待設計之自動撒水系統符合儲物空間之滅火需求；並以水力計算軟體KYPIPE評估國內自動倉儲之自動撒水設備幫浦出水量以130L/min（K值＝114）之合理性，發現20個撒水頭系統尚能符合需求，24及30個系統均有不足之情形；以樹狀、環狀及網狀等3種配管模式模擬24個撒水頭放水，以網狀配管模式具有最高之滅火效能，搭配既設合法幫浦規格可以達到法定撒水密度，在不更改既設幫浦及水源情況下，對於既設倉儲提升撒水密度

提供了一個方法。

Advanced Numerical Modelling of Wave Structure Interaction

為了解決Hydraulic的問題，作者 這樣論述：

Dr. David M. Kelly received a first-class Bachelors Degree in Environmental Physics with Mathematics from the University of East Anglia Norwich (UK) in 2000. Dr. Kelly later obtained a PhD. in Civil Engineering from the University of Nottingham (UK), with Prof. Nicholas Dodd as his thesis advisor, i

n January 2009. Dr. Kelly’s PhD thesis focused on developing numerical models for swash zone hydro- morphodynamics. Following this Dr. Kelly worked as a research associate on a knowledge transfer partnership (KTP) between the University of Nottingham and HR Wallingford funded by the UK government. D

r. Kelly was then employed by HR Wallingford as a research engineer and later a senior research engineer. During his time at HR Wallingford Dr. Kelly was responsible for the development and maintenance of a number of commercial CFD codes. In particular Dr. Kelly developed a commercial tsunami propag

ation model and worked on innovative solutions for two-way full Navier Stokes based solvers for fluid structure interactions. Along with Dr. A. Dimakopoulos at HR Wallingford Dr. Kelly co-developed a two phase Navier Stokes solver to simulate oscillating water column wave energy devices for commerci

al application. Dr. Kelly and colleagues at HR Wallingford and the University of Bath have pioneered the use of hybrid Eulerian-Lagrangian particle in cell (PIC) techniques for coastal engineering applications. Dr. Kelly has worked closely with Électricité de France (EDF) R&D to develop several aspe

cts of the TELEMAC modeling suite. Specifically Dr. Kelly has contributed to the numerical modeling of suspended sediment in TELEMAC 2D and recently the advection and diffusion of tracers in TELEMAC 3D. Dr. Kelly’s work forms part of the official TELEMAC modeling suite. Dr Kelly currently works as a

n Assistant Professor at the International Hurricane Research Center at Florida International University where he is the principal developer of the new dynamic adaptive mesh, massively parallel storm surge model. Dr. Kelly has published work in several prestigious international journals including th

e Journal of Fluid Mechanics, Computers and Fluids, International Journal for Numerical Methods in Fluids and the SIAM Journal on Scientific Computing (SISC) and co-supervised two PhD students at UK Universities.Dr. Aggelos Dimakopoulos ([email protected])is a practicing Civil Enginee

r (MEng, MSc, PhD) and an expert in CFD applications to coastal and open channel flows. He has over 13 years of experience in developing and using CFD models. He graduated as a Doctor of Civil Engineering from the University of Patras, Greece and his PhD thesis was on designing and numerically imple

menting a novel turbulent modelling approach for wave breaking in the surf zone. After that he spent one year in Instituto Superior Tecnico as a post-doc researcher and in University of Cyprus as a visiting researcher, where he was mainly involved in CFD modelling of channel flow through vegetation

arrays. Dr. Dimakopoulosjoined HR Wallingford (UK) in May 2012, and since then, he has been involved in a range of commercial and research projects; in particular, he has been involved in developing the CFD capabilities of the company. Dr. Dimakopoulos has been involved in numerous consultancy studi

es concerning the application of CFD models to assess and optimize the design of coastal and hydraulic structures. He is currently leading a team of 2 engineers and 3 PhD students and he is always interested in the development and the application of CFD models, aiming to reduce uncertainties caused

by the interaction of waves, structures and turbulence.Dr. Pablo Higuera Caubilla ([email protected])graduated in 2010, obtaining a first-in-class degree in Civil Engineering. He immediately pursued a MSc in Coastal and Port Engineering (2012) and a PhD in Civil/Coastal Engineering (2015), all of th

em at the University of Cantabria (Spain) and linked to the Environmental Hydraulics Institute IH Cantabria. During his PhD, Dr Higuera studied all sorts of coastal engineering processes using Computational Fluid Dynamics (CFD). As part of his PhD, he developed the open source numerical model ihFoam

, based on OpenFOAM framework. Major achievements included the development of new modules for wave generation and active wave absorption, flow through porous media and a thorough validation of the model. After obtaining his PhD, Dr Higuera was a postdoc at Imperial College London, where he studied f

low and rock mechanics within armour layers in breakwaters, based on CFD and Finite Element Method - Discrete Elements Method (FEMDEM) models, aiding in the incorporation of hydrodynamic forcings to Solidity Project. Dr Higuera is currently a Research Fellow at the National University of Singapore,

where he continues the study of wave-driven hydrodynamics with OpenFOAM. In his free time he continues to contribute to the coastal community with open source developments, now under the name of OlaFoam Project.

超疏水性在結露狀況下對氣冷式熱交換器性能的影響

為了解決Hydraulic的問題，作者莫尼實 這樣論述：

濕空氣冷凝是熱管理系統中常見的過程，在冷凍空調循環中尤為重要，冷凝現象發生於當熱交換器，特別是蒸發器，在低於空氣露點的溫度下操作時。此現象將會導致鰭片側的冷凝液滴(膜)滯留(retention)與橋接(bridging),進而造成風機壓降與能耗的增加。本研究旨在開發一種超疏水熱交換器，通過其疏水特性，最大限度地減少冷凝水的滯留和橋接。本研究提出一種新型的超疏水性鰭片換熱器設計構想，採用傾斜鰭片排列以達到最小壓降和最大節能效果。本研究從熱傳與壓降性能的觀點切入，將新型超疏水性傾斜鰭片換熱器與其他換熱器作比較分析，分別為：超疏水水平鰭片換熱器、親水性傾斜鰭片換熱器、與親水性水平鰭片換熱器。此外，

本研究藉由改變不同的操作條件，如：進氣溫度、相對濕度和鰭片間距，對這四種換熱器進行性能測試。親水和超疏水換熱器中分別以膜狀冷凝和滴狀冷凝模式為主。由於其表面的高潤濕性，親水換熱器會有較大的液滴脫落直徑。相比之下，超疏水換熱器中發生的 Cassie-Baxter 液滴模式，促使了較小的液滴脫落直徑。本研究建立了一個力平衡模型來分析液滴脫落直徑，模型參數包括了表面張力、慣性力與重力對液滴的影響。本研究基於韋伯數(We)與邦德數(Bo)與液滴脫落直徑，引入了一個新的無因次參數( )，該無因次參數 可預測表面的凝結水脫落能力，在給定的鰭片間距下， 越小代表凝結水脫落能力越好。研究結果表明，滴狀冷凝的

超疏水換熱器在濕空氣下的冷凝熱傳性能相較膜狀冷凝的親水性換熱器並未有顯著的提升，此結果可歸因於非凝結性氣體效應。然而，在壓降方面，超疏水性換熱器與親水性換熱器相比，可帶來高達70%的壓降降低，大幅提升節能效果。壓降的降低歸因於聚結誘發的液滴跳躍現象，使得冷凝水連續脫落。