Natural-convection heat transfer in a nonuniform finite annulus with concentric heat source

In this paper, the mechanisms of natural-convection heat transfer inside a nonuniform finite annulus have been numerically investigated. The system is actually a streamlined, water-filled latex balloon with a coaxial cylindrical heating element. The balloon can be applied as a local hyperthermia treatment device for the removal of undesirable tissue if sufficiently high temperatures and preferably uniform surface heat fluxes can be maintained. A validated control-volume-based method has been employed to solve the coupled transient three-dimensional transport equations for laminar free convection. The effects of heat-source temperature distributions and device orientations on the heat transfer have been studied. Possible design improvements of this device are discussed.     

An experimental study of the effect of wall temperature nonuniformity on natural convection in an enclosure heated from the side

An experimental study of natural convection in a parallelepipedal enclosure induced by a single vertical wall is described. The upper half of this wall was warm and the lower half cold. The other enclosure walls were insulated. The temperature and flow measurements were performed in the high Rayleigh number regime (10¹⁰<Ra<5×10¹⁰) by using water as the working fluid. The Rayleigh number was based on the enclosure height and the temperature difference between the warm and the cold part of the driving wall. The flow field featured two flat cells, one filled with warm fluid along the top horizontal wall, and the other filled with cold fluid along the bottom horizontal wall. Each of these cells was surrounded by an additional cell as tall as half the enclosure height. The above flow structure prohibited extensive thermal contact between warm and cold fluid, thus limiting the role of convection on the heat transfer process in the cavity. The findings of this study differ significantly from the findings of previous studies based on the ‘classical’ enclosure model possessing two isothermal vertical walls, the one warm and the other cold, and support the view that the use of ‘more realistic‘ temperature boundary conditions in enclosure natural convection needs careful examination.     

倒相式两分频SM—011声系统

介绍了供专业音响场合使用的两分频倒相式声系统结构,其采用高灵敏度的电动式扬声器单元。介绍的分频器设计软件和箱体设计验证软件,是电声企业极具实用价值的设计开发软件,值得参考。     

建声电声综合设计STIPA探讨——广西省游泳跳水馆的声系统工程介绍

介绍了广西省游泳跳水馆的工程概况,详细介绍了游泳跳水馆STIPA指标的设计过程,并对实施后的第三方检测指标进行了对比,分析了空场条件下观众区STIPA指标的完成情况,最后对游泳跳水馆工程进行了总结。工程经过清华大学建筑物理实验室的咨询指导,中建八局的精心施工、调试,最终实现了在空场RT60为7 s条件下的STIPA实现了0.50的任务目标。扩声系统顺利通过了第三方检测的工程验收,扩声工程验收指标达到和超过国家标准GB/T 28049—2011的体育馆扩声一级指标。     

机场广播新技术

随着时代进步,公共广播技术得到了长足的发展。近年来,机场广播的音质逐渐得到重视,用于机场的公共广播系统也呈现出了很多崭新的技术亮点,针对这些新技术作了介绍和分析。     

多波束声发射系统的实现

提出了基于能量对比原理的多波束形成算法,设计并实现了多方向声频发射系统.数值仿真和实验结果表明,该系统可实现两个不同方向的可听声波束传播,在800Hz以上,目标区域的测量声压级比其他方向高10dB以上.     

利用参量阵扬声器进行有源噪声控制的研究

在有源噪声控制系统中,由于传统扬声器具有全指向性,在控制点处获得降噪效果的同时,在声场其他区域噪声会增大.参量阵扬声器是具有强指向性的新型声频声源,可以作为有源噪声控制系统中的次级声源,以实现特定方向或区域的降噪,同时减少对声场其他区域的影响.对参量阵扬声器和传统扬声器作为次级声源的有源噪声控制系统进行了仿真实验,结果...     

Subjective Listening Experiments on a Front and Rear Array‐Based WFS System

Wave field synthesis (WFS) has been gathering more and more attention recently due to its ability to perfectly reproduce an original sound field. However, to realize theoretically perfect WFS, a four‐sided loudspeaker array that encloses the listener is required. However, it is difficult to build such a system except in large listening spaces, such as a theater or concert hall. In other words, if the listening space is a home, installing a side loudspeaker array is impractical. If the two side walls located to the left and right of the listener can be omitted, a setup using only front and rear loudspeaker arrays may be a solution. In this letter, we present a subjective listening experiment of sound localization/distance based on a WFS using a front and rear loudspeaker array system which is conducted on two listening points and shows average localization errors of 6.1° and 9.18°, while the average distance errors are –27% (0.5 m) and –29% (0.6 m), respectively.     

Conjugate conduction-natural convection in an enclosure with time-periodic sidewall temperature and inclination

The unsteady conjugate conduction-natural convection in enclosure is of great theoretical significance and is widely encountered in engineering applications in the areas of fluid dynamics and heat transfer. However, there are relatively few efforts to investigate the unsteady flow physics and heat transfer characteristics in the inclined enclosure of finite thickness walls. In the present work, this problem is numerically investigated by a high accuracy multidomain temporal-spatial pseudospectral method. The enclosure is filled with Boussinesq fluid and is bounded by four finite thickness and conductive walls; one of the vertical sidewall is exposed to time-periodic temperature environment while the opposite sidewall holds constant temperature; the top and bottom walls are assumed to be adiabatic. Particular efforts are focused on the effects of three types of influential factors: the wall thermophysical properties, the time-periodic temperature patterns and the inclination, and the time-periodic flow patterns and heat transfer characteristics are presented. Numerical results reveal that within the present parameter range, the heat transfer rate increases almost linearly with the thermal conductivity ratio and thermal diffusivity ratio but decreases with the inclination angle. Moreover, the heat transfer could be enhanced or weakened by selecting different temperature pulsating period in the case of finite thickness wall, while it is always enhanced if the walls are zero thickness. The back heat transfer and heat transfer resonance phenomena are observed, and their relationships with the time-periodic flow patterns and temperature distributions are analyzed. The findings are helpful to the understandings of the fluid flow and heat transfer mechanisms in the related enclosure configurations, and may be of engineering use in thermal design improvement.     

Active modal control for sound field in a room

I.IntroductionInlate198()'s,thestudiesonactivenoisecontrolhavebeengraduallyturnedfromtheductsandopenspacestothemorepracticaIenclosedsoundfields.SomespeciaIworkinaccordancewiththeactiveattenuationofcabinnoisehasstartedwiththeoreticalmechanisms,systemdesignandtransducerdevelopmellt.Intensivereflectionsandtheformedstandingwavedistributioni11al1enclosedsoundfieldarealwaysthemaindifficultiesforactivenoisecontrolinthesecases.Ontheotherhand,normalmoderesponseofthefieldalsoimplementsanewmethod,theap…