KUET Institutional Repository (Khulna University of Engineering & Technology)
Not a member yet
1045 research outputs found
Sort by
Wear Rate Comparison of Different Impeller Materials for Pumping Various Types of Slurry
No full textThis thesis is submitted to the Department of Mechanical Engineering, Khulna University of Engineering & Technology in partial fulfillment of the requirements for the degree of Master of Engineering in Mechanical Engineering, May 2019.Cataloged from PDF Version of Thesis.Includes bibliographical references (pages 56-57).Erosive wear can as defined as solid deduction process from a solid superficial due to frictional action between the slurry and surface. It is triggered by the effect of solid particles contains by slurry in contradiction of the surface of a solid body. The impacting solid particles progressively take away material from the solid superficial due to cutting action. Erosive wear is a significant factor for design centrifugal pump impeller and pumping slurry. Impeller wear is a very common phenomenon for every industry and slurry transportation system. Slurry erosion takes place in our civilized life such as thermal power plants, hydro power plants, excavating businesses, food handling productions, construction and civil works, oil field, solid-liquid hydro transportation systems, coal liquefaction plants, and boilers.
As the Slurry erosion related machinery or equipment demand is becoming so acute day-by-day, scientists are giving efforts on the aptitudes of utilizing applicable technologies to reduce erosion from the related machinery or equipment. As a result performance of slurry equipment, dependability and operation lifetime of the slurry equipment are significantly improved.
Slurry erosion tester ordinarily used to investigate the comparative erosion behavior and characteristics of various materials expose to slurry at moderate solid concentrations. Slurry erosion tester is a modest and convenient apparatus to determine slurry erosion of different equipment.
In this project, a pin mill type slurry-pot wear tester has been made. Total four types (aluminum, brass, mild steel and cast iron) of material with two geometries (flat bar and impeller) have been made for test. Slurry has been made by mixing silica sand and water by at required ratio in a GI container (slurry pot). All samples has been tested by the developed apparatus and determined wear rate with respect to various parameters like slurry density, shaft speed, impact angle and time. This apparatus is used for performing experiments on numerous samples of dissimilar materials exposed to slurry erosion.
In this experiment, total four types of impeller material with two geometries is used for testing at different operating condition such as impact angle, velocity, density and time. Among the eight samples brass is more erosive for both type of geometries (Flat bar and Impeller). On the other hand, cast iron is less erosive for impeller type geometry (45-degree impact angle) but for flat bar type geometry (0-degree impact angle) mild steel is less erosive. If impact angle and density are increased, erosion is found to increase for all types of materials and geometries. From the obtained results, it is clear that by this testing apparatus different types of materials can be tested and suitable pump impeller materials for different application can be found out.Sandip KarmokarMaster of Engineering in Mechanical Engineerin
Production of Liquid Fuel from Rice Husk and Sawdust
No full textThis thesis is submitted to the Department of Energy Science and Engineering, Khulna University of Engineering & Technology in partial fulfillment of the requirements for the degree of Master of Science in Energy Science and Engineering, May 2019.Cataloged from PDF Version of Thesis.Includes bibliographical references (pages 56-62).Energy is the key input to economic growth of a nation and there is a close relation between
accessibility of energy and escalation in the quality of nation. As conventional energy sources
are limited and will diminish in future after complete consumption, so it is the high time to deal
with the renewable and non-conventional energy sources. The necessity of liquid fuel is not only
in the transport sector rather it is required in industrial and power sector. Production of liquid
fuel from ligno-cellulosic material is one of the sources of renewable energy. As Bangladesh is
an agricultural country, rice husk and sawdust are the common sources among all sources of
cellulosic material available in the country. In the present study, fermentation method is used to
produce liquid fuel from rice husk and sawdust. For fermentation process simultaneous
saccharification and fermentation (SSF) process being used. In the process, husk and sawdust
was pretreated to neutralize it and then saccharification was carried out with cellulase enzyme
with different proportion where temperature was maintained at around 37oC for 84 hours.
Fermentation reagents were prepared by adding yeast, peptone and dextrose for yeast inoculums.
Saccharified slurry was clutched to fermentation in a mixture of reagents and fermentation
medium. The process was carried out for one day in aerobic condition and then next three days in
anaerobic condition at a temperature of 35oC. After fermenting clear supernatant is obtained
from centrifugation and then gas chromatography (GC) was performed on the product for
estimation of ethanol. In the experimentation rice husk and enzyme mixture was added at the
ratios of 2.5:1, 3:1 and 3.5:1 respectively. The yields of ethanol are respectively 9.55% (v/w),
8.73% (v/w) and 6.74% (v/w) from respective fermented liquid broth. Sawdust and enzyme ratio
of 2.5:1 provide a very low about 1.23% (v/w) of ethanol. This shows that sawdust not
prospective but rice husk is a prospective source of extraction of liquid fuel by fermentation.Md. Kamrul IslamMaster of Science in Energy Science and Engineerin
Effect of Fillers on Hot-Mix Asphalt Concrete
No full textThis thesis is submitted to the Department of Civil Engineering, Khulna University of Engineering & Technology in partial fulfillment of the requirements for the degree of Masters of Science in Civil Engineering, July 2018.Cataloged from PDF Version of Thesis.Includes bibliographical references (pages 89-92).Different studies have shown that the properties of fillers have significant effect on the
performance of HMA concrete pavements.
This study was intended to investigate the effect of different types of fillers on Hot-
Mix-Asphalt performance. The fillers, with different percentages (4% to 8%) by total
weight of the mixture, used in the study where crushed stone dust, brick dust and fly ash
passing 0.075mm sieve.
Using the different types and quantity of the fillers, a number of trial mixes have been
prepared using the Marshall mix design procedure to arrive at asphalt concrete mixture
that fulfilled the Marshall criteria. The effects of each filler type on Marshall properties of
the HMA mixtures at their individual optimum asphalt content were calculated and
possible basis for difference in properties was discussed.
Using the different fillers at their optimum asphalt content, sample were prepared to
observe Marshall properties and moisture susceptibility of asphalt mixtures. The Marshall
Immersion test method was adopted to determine the moisture effect of mixtures in the
laboratory.
The test results show that all types of fillers have an effect on various mixture
properties. Mixtures prepared with brick dust require higher bitumen content to fulfill all
the Marshall requirements. This makes these mixtures more costly practically. Higher
stability values obtained by mixes with stone dust as compared to brick dust and fly ash.
Higher retained stability was obtained by mixes prepared with brick dust and fly ash as
compared to the widely used stone dust. From the study, similar trend of mixture
properties, particularly Marshall properties were observed for mixes made with brick dust
and stone dust as compared to that of fly ash. This indicates that brick dust can be used as
an alternative for the widely used stone dust.
Different characteristics of HMA mixtures were observed by varying the fillers in the
mixture by type and quantity. This indicates that, Fillers are indicates as an important ingredient in the HMA mixture properties. From the results obtained, there is a common
trend in obtaining different mixture properties with different filler content, which shows,
there exists optimum filler content that based performance will be achieved.
The results of this research work is hoped to be used as the basis for further
investigation on the effects of fillers on HMA mixes and improve asphalt concrete
mixtures as well as find alternative filler materials.K.M. Faruk HossainMasters of Science in Civil Engineerin
