This model is represented by a superposition of gaussian beams , and can simulate the wave fields of planar or focused transducers radiating at oblique incident through a curved fluid - solid interface . the mgb model is highly efficient and can be easily implemented on an ordinary personal computer 该模型是由一系列高斯声束叠加而成,可模拟直探头和聚焦探头水浸检测斜入射时的声场分布,计算效率高,易于在个人计算机上实现。
Conjugate heat transfer calculation was carried out , with simple algorithm , studied up on boundary condition and modified pressure adapting algorithm , to give prediction on velocity field inside the disk cavity , the whole temperature field including fluid region and solid region , and heat transfer coefficient at fluid - solid interface . the simulation results indicate , ( 1 ) in rotor - stator disc cavity , the secondary flows near rotating disc stronger than which near state disc , keeps temperature of rotating disc lower than state disc ' s 为了使计算方法得到更多的算例验证,本次研究做了若干算例,文中选出其中四个算例进行分析,计算结果表明: ( 1 )在转静盘腔结构中,转盘表面的二次流大部分区域都比静盘表面的要强,所以转盘表面换热情况较好,转盘的总体温度水平要低于静盘。
The globalization course was that the preformed texture recrystallized and became the granular equiaxed grain , when the temperature rose and the holding time prolonged , the granular grain melted at some area and at the liquid - solid interface the grain globalized at the role of the curvature overheated 过程机制为:挤压形变组织在加热过程中首先发生再结晶长大变为颗粒状等轴晶;随温度升高和保温时间延长,等轴晶发生局部熔化,液固界面的曲率过热使晶粒外形向球状转变。
Moreover , nh3 gas from dissociation of ( nh4 ) 3zncl5 , analogous to the inert gas , can adjust the growth rate of znse and stabilize the vapor - solid interface , and avoid the difficulties of the non - emerging of sen ( n = 2 ~ 8 ) in selenium vapor . above all , ( nh4 ) 3zncl5 is a novel transport agent with comprehensive advantages 此外,该输运剂可提供类惰性气体nh _ 3而稳定气固生长界面,并可避免了se _ n ( n = 2 - 8 )共存所导致的se _ n相互竞争降低se分压等工艺问题,是一种多功能的znse晶体气相生长输运剂。
Abstract : a new simulating method is established for the calcul ation of the hardness profile of high - carbon - concentration deep - carburization , on the basis of analyzing this process and taking into account the influence o f carbide solution and dissolution , carbon - concentration and temperature on the diffusion behavior , and the influence of the environment factor on carbon trans fer through the gas - solid interface 文摘:在对高浓度深层渗碳的特点进行分析的基础上,考虑到碳化物的析出与溶解、温度及碳浓度对扩散行为的影响,气氛环境对相界面碳传递过程的影响,淬火烈度对渗碳层冷却效果的影响,提出了一种新的模拟高浓度深层渗碳渗层硬度分布的方法。