Pub Date : 2020-04-01DOI: 10.1615/jflowvisimageproc.2020030930
G. M. Nayak, D. Sellan, Raju Murugan, S. Balusamy, Sayak Banerjee, P. Kolhe
Rainbow schlieren deflectometry was employed to characterize the flame structure of Laminar unsteady LPG jet diffusion flame. The schlieren images were acquired at 4000 Hz sampling rate for sooting LPG flame at Re = 500, and Abel inversion was employed to estimate local field refractive index difference. A priori relationship between refractive index difference and temperature was established using the opposed flow flame reactor concept. Peak temperature observed in the near field region is around 1300 K, which falls in the range for a typical sooting flame. Although the sooting flame was observed it depicted typical flicker behavior of the unsteady laminar diffusion flame. Flicker behavior and flame puff formation can be attributed to the interaction of buoyancy sustained outer vortical structure with the flame surface. It was observed that additional air entrainment during puff formation leads to higher temperatures in the puff, which can be attributed to better oxidation of carbon soot and its precursors at downstream locations, a unique feature of sooting flames. Irrespective of whether spacetime evolution at any axial location or frequency spectrum analysis of temporal signal of hue at any spatial location or the amplitude-time signal for decomposed mode from POD analysis of color schlieren images, is employed the global unique flicker frequency of 13.33 Hz was observed in the near field LPG diffusion flame. Interestingly the first two dominant energy modes of POD analysis corresponds to flow features indicating strong ambient air entrainment.
{"title":"INVESTIGATION OF LPG SOOTING DIFFUSION FLAME BY RAINBOW SCHLIEREN DEFLECTOMETRY","authors":"G. M. Nayak, D. Sellan, Raju Murugan, S. Balusamy, Sayak Banerjee, P. Kolhe","doi":"10.1615/jflowvisimageproc.2020030930","DOIUrl":"https://doi.org/10.1615/jflowvisimageproc.2020030930","url":null,"abstract":"Rainbow schlieren deflectometry was employed to characterize the flame structure of Laminar unsteady LPG jet diffusion flame. The schlieren images were acquired at 4000 Hz sampling rate for sooting LPG flame at Re = 500, and Abel inversion was employed to estimate local field refractive index difference. A priori relationship between refractive index difference and temperature was established using the opposed flow flame reactor concept. Peak temperature observed in the near field region is around 1300 K, which falls in the range for a typical sooting flame. Although the sooting flame was observed it depicted typical flicker behavior of the unsteady laminar diffusion flame. Flicker behavior and flame puff formation can be attributed to the interaction of buoyancy sustained outer vortical structure with the flame surface. It was observed that additional air entrainment during puff formation leads to higher temperatures in the puff, which can be attributed to better oxidation of carbon soot and its precursors at downstream locations, a unique feature of sooting flames. Irrespective of whether spacetime evolution at any axial location or frequency spectrum analysis of temporal signal of hue at any spatial location or the amplitude-time signal for decomposed mode from POD analysis of color schlieren images, is employed the global unique flicker frequency of 13.33 Hz was observed in the near field LPG diffusion flame. Interestingly the first two dominant energy modes of POD analysis corresponds to flow features indicating strong ambient air entrainment.","PeriodicalId":41984,"journal":{"name":"JOURNAL OF FLOW VISUALIZATION AND IMAGE PROCESSING","volume":"27 1","pages":"297-318"},"PeriodicalIF":0.6,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47835050","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}
Pub Date : 2020-01-01DOI: 10.1615/JFLOWVISIMAGEPROC.2019031040
Jyoti Gupta, S. Satish, A. Saha
{"title":"VORTEX FORMATION IN A LOW ASPECT RATIO SYNTHETIC JET","authors":"Jyoti Gupta, S. Satish, A. Saha","doi":"10.1615/JFLOWVISIMAGEPROC.2019031040","DOIUrl":"https://doi.org/10.1615/JFLOWVISIMAGEPROC.2019031040","url":null,"abstract":"","PeriodicalId":41984,"journal":{"name":"JOURNAL OF FLOW VISUALIZATION AND IMAGE PROCESSING","volume":"27 1","pages":"117-141"},"PeriodicalIF":0.6,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67572905","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}
Pub Date : 2020-01-01DOI: 10.1615/jflowvisimageproc.2020031008
K. Sharma, S. Dutta
{"title":"WAKE SENSITIVITY OF FLOW OVER A SQUARE CYLINDER WITH RESPECT TO LENGTH OF AN ATTACHED FLEXIBLE WAKE SPLITTER","authors":"K. Sharma, S. Dutta","doi":"10.1615/jflowvisimageproc.2020031008","DOIUrl":"https://doi.org/10.1615/jflowvisimageproc.2020031008","url":null,"abstract":"","PeriodicalId":41984,"journal":{"name":"JOURNAL OF FLOW VISUALIZATION AND IMAGE PROCESSING","volume":"27 1","pages":"269-296"},"PeriodicalIF":0.6,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67573570","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}
Pub Date : 2020-01-01DOI: 10.1615/jflowvisimageproc.2020033379
zhang xianhong, Li Shuseng
{"title":"EDGE DETECTION ALGORITHM FOR COLOR IMAGES BASED ON THE REACTION-DIFFUSION EQUATION AND THE CELLULAR NEURAL NETWORK MODEL","authors":"zhang xianhong, Li Shuseng","doi":"10.1615/jflowvisimageproc.2020033379","DOIUrl":"https://doi.org/10.1615/jflowvisimageproc.2020033379","url":null,"abstract":"","PeriodicalId":41984,"journal":{"name":"JOURNAL OF FLOW VISUALIZATION AND IMAGE PROCESSING","volume":"1 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67573980","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}
Pub Date : 2020-01-01DOI: 10.1615/jflowvisimageproc.2020031021
Shubham Uttam, Piru Mohan Khan, Irshad Alam, Somnath Roy
{"title":"BEHAVIOR OF WALL SHEAR STRESS NEAR CAROTID ARTERY BIFURCATION AT ELEVATED PULSE RATES","authors":"Shubham Uttam, Piru Mohan Khan, Irshad Alam, Somnath Roy","doi":"10.1615/jflowvisimageproc.2020031021","DOIUrl":"https://doi.org/10.1615/jflowvisimageproc.2020031021","url":null,"abstract":"","PeriodicalId":41984,"journal":{"name":"JOURNAL OF FLOW VISUALIZATION AND IMAGE PROCESSING","volume":"27 1","pages":"249-267"},"PeriodicalIF":0.6,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67573443","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}
Pub Date : 2020-01-01DOI: 10.1615/jflowvisimageproc.2020031075
V. Kishor, R. Kumar, Suneet Singh, A. Srivastava
{"title":"NONINTRUSIVE EXPERIMENTAL STUDY OF NATURAL CONVECTION IN AN OPEN SQUARE CAVITY AT DIFFERENT INCLINATIONS","authors":"V. Kishor, R. Kumar, Suneet Singh, A. Srivastava","doi":"10.1615/jflowvisimageproc.2020031075","DOIUrl":"https://doi.org/10.1615/jflowvisimageproc.2020031075","url":null,"abstract":"","PeriodicalId":41984,"journal":{"name":"JOURNAL OF FLOW VISUALIZATION AND IMAGE PROCESSING","volume":"27 1","pages":"333-357"},"PeriodicalIF":0.6,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1615/jflowvisimageproc.2020031075","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67573887","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}
Pub Date : 2020-01-01DOI: 10.1615/jflowvisimageproc.2020031046
Anurag Pant, B. A. Puthenveettil
We study the expansion of a vortex ring generated due to the spreading of ethanol-water droplets, with ethanol concentration range of 20%6Ce6100%, on the surface of a 50 mm deep water layer. Once deposited on the water layer, the surface tension difference leads to some part of the lighter ethanol droplet spreading as a thin film over the water layer. We observe an expanding vortex ring below the radially spreading film front. We visualize the film spreading from top using aluminum particles, while the vortex is visualized from the side using polyamide particles with LIF from the dyed drop used to distinguish the alcohol from the water. PIV is used to obtain the velocity and the vorticity fields below the spreading film. Vortex regions and their centers, identified by the λ2 method from the velocity fields, are tracked to determine the vortex expansion. We show that the vortex ring expands with the same velocity of expansion as that of the spreading ethanol film at the free surface, possibly since the vortex ring is created due to the surface tension difference across the film front. Using dimensional arguments, we also propose a scaling for the upward velocity, induced by this expanding vortex ring, uΓ and show that uΓ ∼ t−1/2.
{"title":"VORTEX RING BELOW A SPREADING ALCOHOL FILM ON WATER","authors":"Anurag Pant, B. A. Puthenveettil","doi":"10.1615/jflowvisimageproc.2020031046","DOIUrl":"https://doi.org/10.1615/jflowvisimageproc.2020031046","url":null,"abstract":"We study the expansion of a vortex ring generated due to the spreading of ethanol-water droplets, with ethanol concentration range of 20%6Ce6100%, on the surface of a 50 mm deep water layer. Once deposited on the water layer, the surface tension difference leads to some part of the lighter ethanol droplet spreading as a thin film over the water layer. We observe an expanding vortex ring below the radially spreading film front. We visualize the film spreading from top using aluminum particles, while the vortex is visualized from the side using polyamide particles with LIF from the dyed drop used to distinguish the alcohol from the water. PIV is used to obtain the velocity and the vorticity fields below the spreading film. Vortex regions and their centers, identified by the λ2 method from the velocity fields, are tracked to determine the vortex expansion. We show that the vortex ring expands with the same velocity of expansion as that of the spreading ethanol film at the free surface, possibly since the vortex ring is created due to the surface tension difference across the film front. Using dimensional arguments, we also propose a scaling for the upward velocity, induced by this expanding vortex ring, uΓ and show that uΓ ∼ t−1/2.","PeriodicalId":41984,"journal":{"name":"JOURNAL OF FLOW VISUALIZATION AND IMAGE PROCESSING","volume":"1 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67573949","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}
Pub Date : 2020-01-01DOI: 10.1615/jflowvisimageproc.2020034163
M. Pal
{"title":"LIQUID AND VAPOR PHASE BEHAVIOR OF HIGH PRESSURE n-HEXANE SPRAY","authors":"M. Pal","doi":"10.1615/jflowvisimageproc.2020034163","DOIUrl":"https://doi.org/10.1615/jflowvisimageproc.2020034163","url":null,"abstract":"","PeriodicalId":41984,"journal":{"name":"JOURNAL OF FLOW VISUALIZATION AND IMAGE PROCESSING","volume":"1 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67573988","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}
Pub Date : 2020-01-01DOI: 10.1615/jflowvisimageproc.v27.i1.10
A. Srivastava, S. Balasubramanian, K. Muralidhar
{"title":"PREFACE: 7th INTERNATIONAL AND 45th NATIONAL FLUID MECHANICS AND FLUID POWER CONFERENCE","authors":"A. Srivastava, S. Balasubramanian, K. Muralidhar","doi":"10.1615/jflowvisimageproc.v27.i1.10","DOIUrl":"https://doi.org/10.1615/jflowvisimageproc.v27.i1.10","url":null,"abstract":"","PeriodicalId":41984,"journal":{"name":"JOURNAL OF FLOW VISUALIZATION AND IMAGE PROCESSING","volume":"27 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1615/jflowvisimageproc.v27.i1.10","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67589839","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}
Pub Date : 2020-01-01DOI: 10.1615/JFLOWVISIMAGEPROC.2020031038
D. Raja, S. Das
{"title":"WAVE BREAKING AND SWIRLS IN A CIRCULAR CYLINDRICAL CONTAINER DURING LATERAL SLOSHING","authors":"D. Raja, S. Das","doi":"10.1615/JFLOWVISIMAGEPROC.2020031038","DOIUrl":"https://doi.org/10.1615/JFLOWVISIMAGEPROC.2020031038","url":null,"abstract":"","PeriodicalId":41984,"journal":{"name":"JOURNAL OF FLOW VISUALIZATION AND IMAGE PROCESSING","volume":"27 1","pages":"319-332"},"PeriodicalIF":0.6,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67573597","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}
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