NOPR Collection:

Stress analysis on the major parts of a bulb turbine using FEA-A case study

2016-07-20T04:48:32Z

Title: Stress analysis on the major parts of a bulb turbine using FEA-A case study Authors: Kuppuswamy, N; Rudramoorthy, R; Mayilsamy, K Abstract: In the bulb turbine, main shaft and stay column play important role. Main shaft is positioned horizontally. More stress concentration occurs near the junction of stay column with concrete at the top and bottom, since the entire load is being taken care of by stay columns at the top and bottom. A finite element analysis (FEA) has been made using ANSYS software to find out structural stability with stress distribution for bulb turbine and the reasons for high vibration and vertical cracks in the concrete structure of the powerhouse. Results from FEA analysis show that the bulb turbine operation is safe when the stay columns are fitted with pipe jacks. This method reduces stress concentration at the junction of stay column with concrete. Page(s): 402-409

Optimal design of an Indian carpet weaving loom structure

2009-06-28T16:30:47Z

Title: Optimal design of an Indian carpet weaving loom structure Authors: Chaudhary, Himanshu; Saha, Subir Kumar Abstract: Present looms to weave the carpets in India are made of wood, which are susceptible to termite attacks and low service life. Besides, the high tension in the warps is generated manually through the pull of a rope by 2-3 persons. In order to avoid the above difficulties, an improved metallic loom was developed at IIT Delhi in 2001, which made weaving easy but the cost of loom is high. In this paper, optimisation of the metallic loom is carried out resulting in relatively lightweight and reduced cost. The design is verified using the Finite Element Analysis software, ANSIS. Page(s): 410-415

Removal of direct dye from aqueous solutions with an adsorbent made from tamarind fruit shell, an agricultural solid waste

2009-06-27T16:31:08Z

Title: Removal of direct dye from aqueous solutions with an adsorbent made from tamarind fruit shell, an agricultural solid waste Authors: Reddy, M C Somasekhara Abstract: Removal of a direct dye, Congo Red, has been carried out using tamarind fruit shell (TFS) as an adsorbent. Parameters like agitation time, adsorbent dosage and pH effect have been studied. Adsorption followed the first-order rate expression. The equilibrium data fit well with both Langmuir and Freundlich models of adsorption. Desorption experiments confirmed that major mode of adsorption is ion-exchange for the dye. Page(s): 443-446

Biodesulfurization of hydrodesulfurized diesel in a trickle bed reactor—Experiments and modeling

2009-06-29T16:30:35Z

Title: Biodesulfurization of hydrodesulfurized diesel in a trickle bed reactor—Experiments and modeling Authors: Mukhopadhyaya, M; Chowdhury, R; Bhattacharya, P Abstract: Hydrodesulfurized diesel [sulfur content, 200-540 ppm (mg/dm³)] has been used for bio-desulfurization using Rhodococcus sp. Biomass concentration with the progress of time has been determined using dry cell weight method. Batch studies have been conducted with a two phase medium [non-aqueous to aqueous phase ratio, 10:90 to 100:0 (i.e. 0-100% diesel)]. Sulfur concentration has been determined using a Universal Oil Products (UOP) standard method (UOP 357-80). Microbial strains have been observed to follow classical Monod type growth kinetics under the present range of substrate concentration. A systematic and programmed analysis was made to determine following intrinsic kinetic parameters: maximum growth rate (µ_max), 0.096 h^-1; and half saturation constant (Ks), 71 mg/dm³. Biodesulfurization of hydrodesulfurized diesel has been conducted in a trickle bed reactor (diam, 0.066 m; height, 0.6 m) under continuous mode. Pith balls have been used as the immobilization matrix for the microorganisms with a constant bed porosity of 0.6. Flow rate of inlet diesel has been varied (0.25-0.5 dm³/h). Sulfur conversion up to 99% has been achieved. A mechanistic mathematical model, developed for the trickle bed bioreactor, can explain the reality satisfactorily. Page(s): 432-436