Volume 7: Fluids Engineering最新文献_第5页

An Assessment of the Validity of Quasi-Steady Analysis of Pressure Relief Valves 溢流阀准稳态分析的有效性评价

Volume 7: Fluids Engineering Pub Date : 2019-11-11 DOI: 10.1115/imece2019-10607

Christopher Doyle, W. Dempster, S. Taggart

{"title":"An Assessment of the Validity of Quasi-Steady Analysis of Pressure Relief Valves","authors":"Christopher Doyle, W. Dempster, S. Taggart","doi":"10.1115/imece2019-10607","DOIUrl":"https://doi.org/10.1115/imece2019-10607","url":null,"abstract":"\u0000 In this paper, the validity of the commonly used quasi-steady design approach to pressure relief valves (PRV) is examined by comparing detailed steady state conditions of valve behavior directly with transient conditions. To achieve this, a PRV conforming to ASME VIII standards was modelled using the commercial computational fluid dynamics (CFD) package ANSYS FLUENT to account for transient fluid-structure interaction processes. Detailed steady state CFD simulations were conducted using quasi-steady assumptions and compared to high fidelity transient moving mesh simulations to allow the piston forces to be examined. The results indicated that noticeably different magnitudes can occur between steady state and transient simulations; highlighting the possibility of significant differences occurring between quasi steady designed valves and their ultimate performance. In this paper, a single operating condition is examined, using air at 10.3 barg, for a 5231BX refrigeration valve supplied by the Henry Group to highlight the main issues. Analysis has indicated that the differences in performance are generated by temporal, short lived vortices at the piston surface which influences the bulk flow features as the disc accelerates and decelerates; altering the net disc forces when compared to steady state conditions.","PeriodicalId":229616,"journal":{"name":"Volume 7: Fluids Engineering","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127993553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

CFD Analysis of Reversed Installation on Flow Measurements by a Plate Orifice 板孔流量测量反装的CFD分析

Volume 7: Fluids Engineering Pub Date : 2019-11-11 DOI: 10.1115/imece2019-10620

D. Zheng, Haibo Ma, A. Silaen, Chenn Q. Zhou

引用次数: 0

The Effect of Mixing Promotors on Sweeping Gas Membrane Distillation System Performance 混合促进剂对扫气膜蒸馏系统性能的影响

Volume 7: Fluids Engineering Pub Date : 2019-11-11 DOI: 10.1115/imece2019-10727

U. Alqsair, Anas M. Alwatban, Ahmed M. Alshwairekh, Robert Krysko, Abdullah A. Alghafis, A. Oztekin

{"title":"The Effect of Mixing Promotors on Sweeping Gas Membrane Distillation System Performance","authors":"U. Alqsair, Anas M. Alwatban, Ahmed M. Alshwairekh, Robert Krysko, Abdullah A. Alghafis, A. Oztekin","doi":"10.1115/imece2019-10727","DOIUrl":"https://doi.org/10.1115/imece2019-10727","url":null,"abstract":"\u0000 Computational fluid dynamics simulations were conducted to model the effect of adding mixing promoters in sweeping gas membrane distillation modules. Net-type spacers of 45° are placed in the feed side while membrane corrugation is employed with the tips of the corrugation pointing towards the permeate side. The membrane corrugation is of chevron type. The membrane is considered as a functional surface, and the vapor flux through the membrane is modeled using the Dusty-Gas model. The vapor flux equation couples the vapor pressure variation across the membrane with the feed concentration. The flow inside the channels with mixing promoters is considered turbulent. The k–ω SST turbulent model is used to model the steady-state turbulent structures inside the channels. The flow rate in the feed side is fixed, and the flow rate in the permeate channel is varied so that Rep = 1000,1500, and 2000 are considered. The inlet feed and permeate temperatures, and the membrane properties are fixed. The results indicate that the presence of mixing promoters increases the vapor permeation through the membrane by alleviation of the concentration and temperature polarization effects. The mixing promoters are more effective at high flow rates in both channels.","PeriodicalId":229616,"journal":{"name":"Volume 7: Fluids Engineering","volume":"378 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133174571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Experimental Investigation of Water Emulsion Fuel Stability 水乳状燃料稳定性实验研究

Volume 7: Fluids Engineering Pub Date : 2019-11-11 DOI: 10.1115/IMECE2019-10258

Gurjap Singh, E. Lopes, Nicholas Hentges, A. Ratner

引用次数: 1

Application of a Hybrid RANS-LES Method to Free Shear Layers 混合ranss - les法在自由剪切层中的应用

Volume 7: Fluids Engineering Pub Date : 2019-11-11 DOI: 10.1115/imece2019-10618

P. Catalano

引用次数: 0

Pressure Drop in Circular Two-Phase Pipe Flow As Influenced by the Angle of Inclination 斜倾角对圆两相管流压降的影响

Volume 7: Fluids Engineering Pub Date : 2019-11-11 DOI: 10.1115/imece2019-11352

B. Worl, S. Nielson, Xiuling Wang

引用次数: 0

Modeling and Analysis of Noise Barrier Shape Effects on Highway Automobiles Emission Dispersion 隔声屏障形状对公路汽车排放扩散影响的建模与分析

Volume 7: Fluids Engineering Pub Date : 2019-11-11 DOI: 10.1115/imece2019-11355

Shaoguang Wang, Xiuling Wang

{"title":"Modeling and Analysis of Noise Barrier Shape Effects on Highway Automobiles Emission Dispersion","authors":"Shaoguang Wang, Xiuling Wang","doi":"10.1115/imece2019-11355","DOIUrl":"https://doi.org/10.1115/imece2019-11355","url":null,"abstract":"\u0000 Noise barriers are common configurations along highways. They are originally designed to impede and absorb the noise from vehicles on highways. Recent research has suggested that noise barriers have significant impacts on near-road automobile emissions. Highway noise barriers can make a great difference on the dispersion of air pollutants on and downstream of highway than those with non-barriers features. Certain shaped noise barriers have better performance on reduction noise than others, but the noise barrier shape effects on emission dispersion are still not clear.\u0000 In this paper a 3-dimensional computational fluid dynamics (CFD) model has been developed to simulate the shape effects on highway downstream and nearby region emission dispersion. The realizable k-ε turbulence model was adopted to simulate the turbulent flow caused by fast moving vehicles on highway. A non-reaction species transport model was applied to simulate emission dispersion. The model was first used to simulate rectangular shaped noise barriers effect on highway emission dispersion. Results were compared with the data from literature, and good agreements were observed. Further, simulations were conducted to reveal the noise barrier shape as well as various height effects on emission dispersion on highway and nearby regions.","PeriodicalId":229616,"journal":{"name":"Volume 7: Fluids Engineering","volume":"207 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131252222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Inclined Injection of Under Expanded Supersonic Gas Jet 欠膨胀超音速气体射流的倾斜喷射

Volume 7: Fluids Engineering Pub Date : 2019-11-11 DOI: 10.1115/imece2019-12020

A. Sheridan, S. Srivastava, M. Henneke, M. S. Raza, K. Sallam

引用次数: 1

Wettability Gradients on Graphene to Drive Bubble Motion 石墨烯的润湿性梯度驱动气泡运动

Volume 7: Fluids Engineering Pub Date : 2019-11-11 DOI: 10.1115/imece2019-10886

Hongyang Yu, Yu Zhao, Jingjie Sha, Yunfei Chen

引用次数: 0

Dynamics of Compound Droplet Passing Through a Conical CTC Microfilter 复合液滴通过锥形CTC微过滤器的动力学研究

Volume 7: Fluids Engineering Pub Date : 2019-11-11 DOI: 10.1115/imece2019-10519

Pengliang Chang, M. Hashem, Xiaolin Chen, H. Tan

{"title":"Dynamics of Compound Droplet Passing Through a Conical CTC Microfilter","authors":"Pengliang Chang, M. Hashem, Xiaolin Chen, H. Tan","doi":"10.1115/imece2019-10519","DOIUrl":"https://doi.org/10.1115/imece2019-10519","url":null,"abstract":"\u0000 Circulating tumor cells (CTCs) are important biomarkers which can be used for early-stage cancer detection and treatment. Developing an efficient approach to detect CTCs from peripheral blood is a challenging problem due to their extreme rarity. The CTC microfiltration provides a good solution as a critical method based on the physical property of CTCs. In this study, we employed a compound droplet model to investigate the transport behavior of a CTC squeezing through a conical-shaped microfilter. The compound droplet model of CTC is composed of a cortical membrane, cytoplasm and the nucleus. Numerically, we used the octree-based Adaptive-Mesh-Refinement (AMR) to analyze the deformable CTC flowing through a microfilter with non-uniform cross-sections. We investigated the pressure-deformability behavior of the cell with different nuclear to cytoplasmic ratio (N/C ratio). Our study revealed that the nucleus smaller than the filter pore did not affect the pressure behaviors significantly. However, when the nucleus is larger than the filter pore size, the pressure behaviors are greatly affected. We also studied the effects of the flow rate on the cell squeezing process. We found that the critical pressure increases significantly with the flow rate. Our study can provide valuable information about cell transport behavior in conical-shaped microfilters.","PeriodicalId":229616,"journal":{"name":"Volume 7: Fluids Engineering","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121276159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1