Experimental and numerical study of turbulent mixing in a model of a polymerization reactor

Xavier Ingle`s,Jordi Pallares,Marı´a Teresa Larre,Luis Me´ndez,Francesc Xavier Grau 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.4

In this study the turbulent mixing in a model of a polymerization reactor is analyzed experimentally and numerically. The model corresponds to a zone of an autoclave reactor equipped with a stirrer. Two different configurations of the stirrer, with different arrangement of the paddles, have been considered. The mixing process has been monitored by following the time-evolution of injections of a passive scalar through the different inlets of the model. The time-evolution of the mixing quality in a laboratory scale model of the reactor has been measured using water and the Planar Laser Induced Fluorescence (PLIF)technique. Numerical simulations of the flow and of the mixing processes were carried out and results of the evolution of the mixing are compared successfully with measurements. The mixing processes are dominated by the flow topology generated by the rotation of the stirrer. Superimposed to the tangential flow, secondary flows divide the length of the reactor in different zones. It has been found that macro mixing in each individual zone is a relatively fast process and that the mixing rates within each zone are very similar. However, the mixing rate between different zones is a relatively slow process.

Challenges in establishing the patient derived human tumor xenografts for cancer research and treatment

Arvind INGLE 한국실험동물학회 2018 한국실험동물학회 학술발표대회 논문집 Vol.2018 No.7

A Role-based Access Control Framework for Video Synopsis in Airport Environment

Palash Yuvraj Ingle(팔라시 잉글),Giluk Kang(강길욱),Jihoon Park(박지훈),Young-Gab Kim(김영갑) 한국통신학회 2023 한국통신학회 학술대회논문집 Vol.2023 No.6

다시점 영상에 대한 이상 물체 탐지 기반 영상 시놉시스 프레임워크

팔라시잉글 ( Palash Yuvraj Ingle ),유진용 ( Jin-yong Yu ),김영갑 ( Young-gab Kim ) 한국정보처리학회 2022 한국정보처리학회 학술대회논문집 Vol.29 No.1

There has been an increase in video surveillance for public safety and security, which increases the video data, leading to analysis, and storage issues. Furthermore, most surveillance videos contain an empty frame of hours of video footage; thus, extracting useful information is crucial. The prominent framework used in surveillance for efficient storage and analysis is video synopsis. However, the existing video synopsis procedure is not applicable for creating an abnormal object-based synopsis. Therefore, we proposed a lightweight synopsis methodology that initially detects and extracts abnormal foreground objects and their respective backgrounds, which is stitched to construct a synopsis.

Building frame - pile foundation - soil interaction analysis: a parametric study

Chore, H.S.,Ingle, R.K.,Sawant, V.A. Techno-Press 2010 Interaction and multiscale mechanics Vol.3 No.1

The effect of soil-structure interaction on a single-storey, two-bay space frame resting on a pile group embedded in the cohesive soil (clay) with flexible cap is examined in this paper. For this purpose, a more rational approach is resorted to using the finite element analysis with realistic assumptions. Initially, a 3-D FEA is carried out independently for the frame on the premise of fixed column bases in which members of the superstructure are discretized using the 20-node isoparametric continuum elements. Later, a model is worked out separately for the pile foundation, by using the beam elements, plate elements and spring elements to model the pile, pile cap and soil, respectively. The stiffness obtained for the foundation is used in the interaction analysis of the frame to quantify the effect of soil-structure interaction on the response of the superstructure. In the parametric study using the substructure approach (uncoupled analysis), the effects of pile spacing, pile configuration, and pile diameter of the pile group on the response of superstructure are evaluated. The responses of the superstructure considered include the displacement at top of the frame and moments in the columns. The effect of soil-structure interaction is found to be quite significant for the type of foundation considered in the study. Fair agreement is observed between the results obtained herein using the simplified models for the pile foundation and those existing in the literature based on a complete three dimensional analysis of the building frame - pile foundation - soil system.

The role of capsule endoscopy in etiological diagnosis and management of obscure gastrointestinal bleeding

( Vikas Pandey ),( Meghraj Ingle ),( Nilesh Pandav ),( Pathik Parikh ),( Jignesh Patel ),( Aniruddha Phadke ),( Prabha Sawant ) 대한장연구학회 2016 Intestinal Research Vol.14 No.1

To investigate the various etiologies, yields, and effects of capsule endoscopy (CE) on management and complications, along with follow up of patients with obscure gastrointestinal (GI) bleeding. Methods: The study group of patients included those having obscure, overt, or occult GI bleeding. The findings were categorized as (A) obvious/definitive, (B) equivocal, or (C) negative. Any significant alteration in patient management post CE in the form of drug or surgical intervention was noted. Results: Total patients included in the study were 68 (48 males and 20 females). The ratio of male:female was 2.4:1. The age ranged between 16 years to 77 years. Mean age for males was 62±14 years, for females 58±16 years. The total yield of CE with definitive lesions was in 44/68 (65.0%) of patients. In descending order (A) angiodysplasia 16/68 (23.53%), (B) Crohn’s disease 10/68 (14.70%), (C) non-steroidal anti-inflammatory drug enteropathy 8/68 (11.76%), (D) small bowel ulcers 4/68 (5.88%), (E) jejunal and ileal polyps 2/68 (2.94%), (F) intestinal lymphangiectasis 2/68 (2.94%), and (G) ileal hemangiomas 2/68 (2.94%) were followed. Equivocal findings 12/68 (17.65%) and negative study 12/68 (17.65%) was found. Complications in the form of capsule retention in the distal ileum were noted in 2/68 (2.94%) subjects. Statistically, there was a higher probability of finding the etiology if the CE was done during an episode of bleeding. Conclusions: CE plays an important role in diagnosing etiologies of obscure GI bleeding. Its role in influencing the management outcome is vital. (Intest Res 2016;14:69-74)

Spectrum of chronic small bowel diarrhea with malabsorption in Indian subcontinent: is the trend really changing?

( Nirav Pipaliya ),( Meghraj Ingle ),( Chetan Rathi ),( Prateik Poddar ),( Nilesh Pandav ),( Prabha Sawant ) 대한장연구학회 2016 Intestinal Research Vol.14 No.1

This study aimed to document the recent etiological spectrum of chronic diarrhea with malabsorption and also to compare features that differentiate tropical sprue from parasitic infections, the two most common etiologies of malabsorption in the tropics. Methods: We analyzed 203 consecutive patients with malabsorption. The etiological spectrum and factors that differentiated tropical sprue from parasitic infections were analyzed. Results: The most common etiology was tropical sprue (n=98, 48.3%) followed by parasitic infections (n=25, 12.3%) and tuberculosis (n=22, 10.8%). Other causes were immunodeficiency (n=15, 7.3%; 12 with human immunodeficiency virus and 3 with hypogammaglobulinemia), celiac disease (n=11, 5.4%), Crohn’s disease (n=11, 5.4%), small intestinal bacterial overgrowth (n=11, 5.4%), hyperthyroidism (n=4, 1.9%), diabetic diarrhea (n=4, 1.9%), systemic lupus erythematosus (n=3, 1.4%), metastatic carcinoid (n=1, 0.5%) and Burkitt’s lymphoma (n=1, 0.5%). On multivariate analysis, features that best differentiated tropical sprue from parasitic infections were larger stool volume (P =0.009), severe weight loss (P =0.02), knuckle hyperpigmentation (P =0.008), low serum B12 levels (P =0.05), high mean corpuscular volume (P =0.003), reduced height or scalloping of the duodenal folds on endoscopy (P =0.003) and villous atrophy on histology (P =0.04). Presence of upper gastrointestinal (GI) symptoms like bloating, nausea and vomiting predicted parasitic infections (P =0.01). Conclusions: Tropical sprue and parasitic infections still dominate the spectrum of malabsorption in India. Severe symptoms and florid malabsorption indicate tropical sprue while the presence of upper GI symptoms indicates parasitic infections. (Intest Res 2016;14:75-82)

Non-linear analysis of pile groups subjected to lateral loads using 'p-y' curve

Chore, H.S.,Ingle, R.K.,Sawant, V.A. Techno-Press 2012 Interaction and multiscale mechanics Vol.5 No.1

The paper presents the analysis of two groups of piles subjected to lateral loads incorporating the non-linear behaviour of soil. The finite element method is adopted for carrying out the parametric study of the pile groups. The pile is idealized as a one dimensional beam element, the pile cap as two dimensional plate elements and the soil as non-linear elastic springs using the p-y curves developed by Georgiadis et al. (1992). Two groups of piles, embedded in a cohesive soil, involving two and three piles in series and parallel arrangement thereof are considered. The response of the pile groups is found to be significantly affected by the parameters such as the spacing between the piles, the number of piles in a group and the orientation of the lateral load. The non-linear response of the system is, further, compared with the one by Chore et al. (2012) obtained by the analysis of a system to the present one, except that the soil is assumed to be linear elastic. From the comparison, it is observed that the non-linearity of soil is found to increase the top displacement of the pile group in the range of 66.4%-145.6%, while decreasing the fixed moments in the range of 2% to 20% and the positive moments in the range of 54% to 57%.

Non linear soil structure interaction of space frame-pile foundation-soil system

Chore, H.S.,Ingle, R.K.,Sawant, V.A. Techno-Press 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.49 No.1

The study deals with physical modeling of space frame-pile foundation and soil system using finite element models. The superstructure frame is analyzed using complete three-dimensional finite element method where the component of the frame such as slab, beam and columns are descretized using 20 node isoparametric continuum elements. Initially, the frame is analyzed assuming the fixed column bases. Later the pile foundation is worked out separately wherein the simplified models of finite elements such as beam and plate element are used for pile and pile cap, respectively. The non-linear behaviour of soil mass is incorporated by idealizing the soil as non-linear springs using p-y curve along the lines similar to that by Georgiadis et al. (1992). For analysis of pile foundation, the non-linearity of soil via p-y curve approach is incorporated using the incremental approach. The interaction analysis is conducted for the parametric study. The non-linearity of soil is further incorporated using iterative approach, i.e., secant modulus approach, in the interaction analysis. The effect the various parameters of the pile foundation such as spacing in a group and configuration of the pile group is evaluated on the response of superstructure owing to non-linearity of the soil. The response included the displacement at the top of the frame and bending moment in columns. The non-linearity of soil increases the top displacement in the range of 7.8%-16.7%. However, its effect is found very marginal on the absolute maximum moment in columns. The hogging moment decreases by 0.005% while sagging moment increases by 0.02%.

Building frame-pile foundation-soil interactive analysis

Chore, H.S.,Ingle, R.K.,Sawant, V.A. Techno-Press 2009 Interaction and multiscale mechanics Vol.2 No.4

The effect of soil-structure interaction on a simple single storeyed and two bay space frame resting on a pile group embedded in the cohesive soil (clay) with flexible cap is examined in this paper. For this purpose, a more rational approach is resorted to using the three dimensional finite element analysis with realistic assumptions. The members of the superstructure and substructure are descretized using 20 node isoparametric continuum elements while the interface between the soil and pile is modeled using 16 node isoparametric interface elements. Owing to viability in terms of computational resources and memory requirement, the approach of uncoupled analysis is generally preferred to coupled analysis of the system. However, an interactive analysis of the system is presented in this paper where the building frame and pile foundation are considered as a single compatible unit. This study is focused on the interaction between the pile cap and underlying soil. In the parametric study conducted using the coupled analysis, the effect of pile spacing in a pile group and configuration of the pile group is evaluated on the response of superstructure. The responses of the superstructure considered include the displacement at top of the frame and moments in the superstructure columns. The effect of soil-structure interaction is found to be quite significant for the type of foundation used in the study. The percentage variation in the values of displacement obtained using the coupled and uncoupled analysis is found in the range of 4-17 and that for the moment in the range of 3-10. A reasonable agreement is observed in the results obtained using either approach.