MIT-World Peace University (MIT-WPU) is a top educational institute located in Pune, India. It is recognized within&nbsp;UGC under Government of Maharashtra Act No. XXXV 2017.&nbsp;

It is part of the MIT group of institutions (established in 1983) which covers 10+ campuses across India and has more than 50,000+ students enrolled across various disciplines at a given point of time. The institute houses 15 schools ranging from Engineering &amp; Technology, Design, Pharmacy, Commerce, Governance among others. It offers undergraduate, postgraduate and PhD programs among different disciplines.&nbsp;

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MIT World Peace University

School of Mechanical Engineering

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Engineering and Technology

International Journal of Current Engineering and Technology

A Review on Cryogenic Grinding A Review on Cryogenic Grinding

In the present experimental study, influence of process parameters in hybrid incremental sheet forming (HISF) is studied. Stretch forming combined with ISF is used for forming of conical parts. Stretch forming or preforming is done in order to get the intermediate shape and thickness distribution. On the same setup final part shape is obtained using the conventional ISF process. A low cost hemispherical-ended wooden preforming tool is used for the preforming purpose. Tools used for ISF process are also hemispherical-ended in shape but having smaller diameters and are made up of stainless steel SS-305. Experiments are designed according to design of experiment (DOE) Taguchi method. Analysis of variance (ANOVA) is used to analyse the effect of process parameters namely preforming depth, tool diameter and pitch on response geometric accuracy. It is found that there is considerable effect of tool diameter on geometric accuracy of the formed part. Also, forming time is reduced considerably due to the preforming operation.

Advances in Materials and Processing Technologies

An Experimental Study on Geometric Accuracy in Hybrid Incremental Sheet Forming

Constant area section length downstream to the fuel injection point is a crucial dimension of scramjet duct geometry. It has a major contribution in creating the maximum effective pressure inside the combustor that is required for propulsion. The length is limited by the thermal choking phenomenon, which occurs when heat is added in a flow through constant area duct. As per theory, to avoid thermal choking the constant area section length depends upon the inlet conditions and the rate of heat addition. The complexity related to mixing and combustion process inside the supersonic stream makes it difficult to predict the rate of heat addition and in turn the length. Recent efforts of simulating the reacting flow inside scramjet combustors are encouraging and can be useful in this regard. The presented work attempts to use simulation results of scramjet combustion for predicting the constant area section length for a typical scramjet combustor. Though the technique appears to be simple, in general it can be applied in the design of combustor ducts where thermal chocking needs to be avoided. A typical scramjet combustor geometry with isolator, constant area section, and diverging section with an intrusive fuel injection scheme from the available experimental work is modeled for simulation. Reacting simulations are done and validated with the available experimental results. The inlet conditions being those corresponding to a Mach 6 scramjet flight. One-dimensional analysis of frictionless flow through constant area ducts is used to calculate maximum possible enthalpy addition in the flow. For the given injector configuration and equivalence ratio of 0.34, the limiting length of constant area section to avoid thermal choking was obtained as 59 mm. The value of this limiting length obtained from simulation is verified. Comments are made about the method.

SAE International Journal of Aerospace

Using Numerical Simulation to Obtain Length of Constant Area Section in Scramjet Combustor

The basic objective of the paper is to identify thedesired circulation ratio for the natural circulation of water tubeboilers in different operating conditions. This requires the basicstudy of heat flux and the mode of the boiling heat transfer, andthe phenomenon like a departure from nucleate boiling and tubeoverheating. The parameters, which need to be studied are heatflux, pressure, dryness fraction, void fraction, liquid velocity andtheir impact on the required circulation ratio. The present work isto develop a circulation analysis model for the natural circulationof the water tube boiler and to check the boiler design for differentfailure modes. For a natural circulation boiler, the circulationratio is one of the most important design parameters as the otherdesign parameter like critical heat flux and skin temperature aremainly derived from the circulation ratio. The requiredcirculation ratio can vary with the boiler pressure, liquid velocityand maximum heat flux. This study is intended to provide inputfor the safe and optimum design of a natural circulation boiler.

Fulltext

International Journal of Recent Technology and Engineering (IJRTE)

Desired Circulation Ratio for Natural Circulation in Water-Tube Boiler

Adequate supply of oxygen is essential for the complete combustion of fuel in the furnace of a boiler and defective duct design may cause serious loss in the boiler efficiency due to incomplete combustion. In boiler there is a system which controls the air flow rate reaching to the furnace. FD fan helps to build the pressure and force the air to pass through the duct and wind box. In wind box, this air will be sent to the furnace for helping combustion process. The main objective of this work was to simulate the flow of air from blower to the inlet of a wind box through rectangular split duct to see whether it could provide improved flow conditions and to see whether there was equal mass flow rate of air through both the legs of a split duct. The purpose of providing a split duct was to eliminate one blower which would otherwise be required for two separate ducts arrangement. A 3D model using CFD was prepared to capture the changes in the mass flow distribution in the duct at two different outlets. Through this analysis, it was found that the mass flow rates of air through the two legs of the split duct were not equal. The damping needs to be provided for the duct having longer length in order to have equal mass flow rate of air through both the legs of the duct.

International Journal of Recent Technology and Engineering

Simulation of Mass Flow Rate of Air through Rectangular Split Duct

Micro forming is a production technology of very small metal elements. This paper presents a concept of grain size regulation during LDH (Limit Dome Height) test. The proposed concept is based on an empirical formulation generated using the experimental results of SS304 and brass. An empirical model is helpful in predicting the load-stroke behavior of different metals. Particularly, results of iron, copper and nickel are demonstrated. Further the concept of control scheme is presented to predict the grain size of the material during micro forming.

Lecture Notes in Electrical Engineering

Grain Size Regulation During LDH Test

Additive manufacturing (AM) is the industrial name of 3D printing, which can fabricate the complex geometry model easily. Fused Deposition Modeling (FDM) is an AM technique used for 3D component printing due to its low cost and good strength. The mechanical properties of the FDM specimens were evaluated experimentally through a tensile test. Polylactic acid (PLA), which is a thermoplastic material, is used in present investigation. It is one of the suitable materials for the FDM technique. It is a biodegradable material produced from renewable resources. The Standard tensile test was conducted on the basis of the ASTM D638 standard for the PLA specimens with a 100% infill density. The flexural specimen was modeled in accordance with the ASTM D790 standard and the material properties derived from the experiments were used for finite element analysis. Further, the finite element analysis of the flexural test is performed to examine the flexural strength of FDM components. © 2020 Author(s).

AIP Conference Proceedings

Finite element analysis of flexural test of additively manufactured components fabricated by fused deposition modelling

International Engineering Research Journal (IERJ) 1 (Special Issue(MECH-PGCON))

CFD Analysis of Premixed Methane-Air Combustion using Laser Ignition CFD Analysis of Premixed Methane-Air Combustionusing Laser Ignition

Additive Manufacturing (AM) is rapidly growing manufacturing technique. Selective Laser Melting (SLM) is most important method in an additive manufacturing. The aim of the research is to analyze the mechanical properties of additively manufactured AlSi10Mg Aluminum alloy and compared with conventional manufacturing. In this work the mechanical properties are investigated of selective laser melting manufactured AlSi10Mg aluminum alloy and compared with sand and gravity die cast AlSi10Mg parts. The results are validated using simufact additive manufacturing software.

Materials Today

Comparative study of mechanical properties of additively manufactured aluminum alloy

The orthodontists generally do not recommend application of force system above the archwire level owing to additional attachments and patient’s discomfort. Hence, the present research study focusses on application of retraction force system at the archwire level. The objective of this study is to specify an optimum combination of archwire and bracket slot size for en-masse (simultaneous) parallel retraction of six maxillary anterior teeth in labial orthodontics (LaO). In this research study, the concept (theoretical) model has been developed based on simple principles of mechanics to estimate the torque generated by different sizes of archwire in bracket slots. Based on torque value, retraction force developed by each combination of archwire and slot size was determined and compared with required retraction force of 150 gram-force on each side of sagittal plane. For combination of 0.019×0.025 inch stalinless steel SS archwire and 0.022 inch SS bracket slot, magnitude of computed retraction force matched closely with aforementioned required force than other combinations and hence, it is recommended in the present research study. The validation of selected combination of archwire and bracket slot size was done successfully by in vivo (clinical) experimentation on three patients. Thus, it proves that the aforementioned combination of archwire and bracket slot size is more suitable than others for retraction force system applied at archwire level.