Experimental evidence for non-linear growth in compressible mixing layer

2014 ◽  
Vol 57 (5) ◽  
pp. 963-970 ◽  
Author(s):  
TieJin Wang ◽  
Jun Chen ◽  
XiaoTian Shi ◽  
Ning Hu ◽  
ZhenSu She
Author(s):  
Debolina Dutta ◽  
Prem Mirchandani ◽  
K. P. Anasha

The Indian IT/ITeS industry is a significant contributor to India’s GDP and has had an impressive growth trajectory. However, it continues to be plagued with talent shortages, managing employee satisfaction, growth aspirations and reducing attrition. COVID-19 has presented an unprecedented opportunity for IT service organisations to transform the established paradigm of working. The industry has been exploring non-linear growth models that address the talent demand-supply gap. With skilled talent shortage continuing to limit the industry growth, non-linear initiatives of growth are urgently required. We propose a model of ‘Internal Gig’ worker (I-GIG) for the IT services industry. The new I-GIG workforce would be providing non-linear outcomes without increasing costs significantly. We also argue that this model would be motivational for employees who opt for it, with commensurate reward motivations to engage them. Additionally, this model would enable the workanywhere, anytime and leverage talent availability on a global scale.


2016 ◽  
Vol 16 (3) ◽  
pp. 702-716 ◽  
Author(s):  
Evelyn Freney ◽  
Sellegri Karine Sellegri Karine ◽  
Asmi Eija ◽  
Rose Clemence ◽  
Chauvigne Aurelien ◽  
...  

2011 ◽  
Vol 15 (01) ◽  
pp. 37-62 ◽  
Author(s):  
D.V.R. Seshadri

The case describes XGen Technologies (name disguised), an India-based IT Enabled Services (ITES) company having to grapple with the issues of linear growth. The company's headcount had touched a whopping 40,000 and managing such a large setup was becoming a severe challenge, putting immense pressure on Partha Sen, the CEO, to adopt an innovative business model to sustain historical growth rates of revenue and profitability. This situation was similar to what most Indian ITES companies faced: they had been clocking impressive growth, yet there were concerns about the future. The case then describes some of the strategies that software companies have been adopting in order to achieve greater non-linearity in their business. In particular, the case concentrates on Zyme Solutions, Inc., a fully outsourced hosted data service provider to the high-tech vertical market, which has built as a non-linear business from the ground up, without the legacy of the linear business models to contend with. Students are put in the place of Partha Sen, having to decide on an approach that established companies like XGen could adopt to transit to a non-linear model.


2018 ◽  
Vol 118 (5) ◽  
pp. 1003-1010 ◽  
Author(s):  
Noriteru Morita ◽  
Junichiro Yamauchi ◽  
Ryosuke Fukuoka ◽  
Toshiyuki Kurihara ◽  
Mitsuo Otsuka ◽  
...  

1991 ◽  
Vol 224 ◽  
pp. 159-175 ◽  
Author(s):  
T. L. Jackson ◽  
C. E. Grosch

We report the results of a comprehensive comparative study of the inviscid spatial stability of a parallel compressible mixing layer using various models for the mean flow. The models are (i) the hyperbolic tangent profile for the mean speed and the Crocco relation for the mean temperature, with the Chapman viscosity–temperature relation and a Prandtl number of one; (ii) the Lock profile for the mean speed and the Crocco relation for the mean temperature, with the Chapman viscosity-temperature relation and a Prandtl number of one; and (iii) the similarity solution for the coupled velocity and temperature equations using the Sutherland viscosity–temperature relation and arbitrary but constant Prandtl number. The purpose of this study was to determine the sensitivity of the stability characteristics of the compressible mixing layer to the assumed thermodynamic properties of the fluid. It is shown that the qualitative features of the stability characteristics are quite similar for all models but that there are quantitative differences resulting from the difference in the thermodynamic models. In particular, we show that the stability characteristics are sensitive to the value of the Prandtl number and to a particular value of the temperature ratio across the mixing layer.


1998 ◽  
Vol 356 ◽  
pp. 25-64 ◽  
Author(s):  
M. F. MILLER ◽  
C. T. BOWMAN ◽  
M. G. MUNGAL

Experiments were conducted to investigate the effect of compressibility on turbulent reacting mixing layers with moderate heat release. Side- and plan-view visualizations of the reacting mixing layers, which were formed between a high-speed high-temperature vitiated-air stream and a low-speed ambient-temperature hydrogen stream, were obtained using a combined OH/acetone planar laser-induced fluorescence imaging technique. The instantaneous images of OH provide two-dimensional maps of the regions of combustion, and similar images of acetone, which was seeded into the fuel stream, provide maps of the regions of unburned fuel. Two low-compressibility (Mc=0.32, 0.35) reacting mixing layers with differing density ratios and one high-compressibility (Mc=0.70) reacting mixing layer were studied. Higher average acetone signals were measured in the compressible mixing layer than in its low-compressibility counterpart (i.e. same density ratio), indicating a lower entrainment ratio. Additionally, the compressible mixing layer had slightly wider regions of OH and 50% higher OH signals, which was an unexpected result since lowering the entrainment ratio had the opposite effect at low compressibilities. The large-scale structural changes induced by compressibility are believed to be primarily responsible for the difference in the behaviour of the high- and low-compressibility reacting mixing layers. It is proposed that the coexistence of broad regions of OH and high acetone signals is a manifestation of a more biased distribution of mixture compositions in the compressible mixing layer. Other mechanisms through which compressibility can affect the combustion are discussed.


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