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RISS 인기검색어
- 검색키워드
- 저자 : Sudip Kumar Das (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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Trend analysis of long-term climatic parameters in Dinhata of Koch Bihar district, West Bengal
Jayanta Das,Sudip Kumar Bhattacharya 대한공간정보학회 2018 Spatial Information Research Vol.26 No.3
The monthly, seasonal and annual trends for five climatic parameters, such as rainfall, rainy days, temperature, relative humidity and sunshine hours were analyzed for the period of 1980–2015. The objective of this study was to detect the long term trend of climatic parameters of the study area. The non-parametric Mann–Kendall test and Sen’s slope estimators methods were used to determine whether there was a positive or negative trend in weather data with their statistical significance. The study area is characterized by high rainfall, receives an annual average rainfall of 3005 ± 820 mm, with an inter-annual variation 27% but analysis of long-term trends in the annual rainfall indicates a decreasing trend (- 14.31 mm year-1) and annual rainy days also significantly decreased (- 0.63 days year-1). In terms of seasonal rainfall, the pre-monsoon and monsoon months exhibited non-significant declining trends, while post monsoon months marginally increased. The result showed significant (P\0.05) warming trend in annual minimum and mean temperature at the rate of 0.14 and 0.05 C year-1 respectively and also showed similar significant (P\0.05) increasing trend in summer (0.05 C year-1) and winter (0.07 C year-1) mean temperature. Decrease in maximum temperature during all the months except September and annual maximum temperature (- 0.04 C year-1) is evident. The study area is experiencing a significant increasing trend in maximum (0.36% year-1), minimum (0.52% year-1) and mean relative humidity (0.13% year-1), with a significant decreasing trend of sunshine hours in pre monsoon (- 0.03 h day-1), post monsoon (- 0.04 h day-1) and mean (- 0.03 h day-1).
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Gas holdup in tapered bubble column using pseudoplastic non-Newtonian liquids
Sumit Kumar Jana,Sudip Kumar Das,Asit Baran Biswas 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.4
Experimental studies on the gas holdup in two tapered bubble columns using non-Newtonian pseudoplasticliquid have been reported. The effects of different variables such as gas flow rate, liquid viscosity, bed height,and orifice diameter of sieve plate on gas holdup have been investigated. An empirical correlation has been developedfor the prediction of the gas holdup as a function of various measurable parameters of the system. The correlation isstatistically acceptable.
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Mandal, Sailendra Nath,Das, Sudip Kumar 한국화학공학회 2003 Korean Journal of Chemical Engineering Vol.20 No.4
Experimental investigations have been carried out to evaluate the two-phase pressure drop and the holdup for flow through helical coils. The coils were made of thick wall transparent PVC tube of diameter 0.01 m and 0.013 m. 24 coils were made at different coil diameter and different helix angles (0° to 12°). Three different liquids were used for the experimental studies and air was the gas. Empirical correlations have been developed to predict the two-phase friction factor and the liquid holdup as functions of the physical and dynamic variables of the system. Statistical analyses of the correlations suggest that they are of acceptable accuracy.
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Process Systems Engineering, Process Safety, Transport Phenomena : Gas-Liquid Flow Through Coils
( Sailendra Nath Mandal ),( Sudip Kumar Das ) 한국화학공학회 2003 Korean Journal of Chemical Engineering Vol.20 No.4
Experimental investigations have been carried out to evaluate the two-phase pressure drop and the holdup for flow through helical coils. The coils were made of thick wall transparent PVC tube of diameter 0.01 m and 0.013 m. 24 coils were made at different coil diameter and different helix angles (0° to 12°). Three different liquids were used for the experimental studies and air was the gas. Empirical correlations have been developed to predict the two-phase friction factor and the liquid holdup as functions of the physical and dynamic variables of the system. Statistical analyses of the correlations suggest that they are of acceptable accuracy.
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Sudipta Let,Nirjhar Bar,Ranjan Kumar Basu,Sudip Kumar Das 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.1
The solid-water fluidized bed was investigated with a binary mixture of irregularly shaped sand particles. A binary mixture was produced by mixing particles of sand for different weight ratios. The influence of various operating parameters on minimum elutriation velocity was investigated. It was observed that the Ume decreases with the increase of the lighter particles in the binary mixture, and the Ume increases with the increase of column diameter. A simplified empirical correlation has been developed to predict minimum elutriation velocity with acceptable statistical parameters. Application concerning a hybrid of artificial neural network (ANN), and genetic algorithm (GA), is successfully predicted.
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