Experimental and numerical investigation on bare tube cross flow heat exchanger-using COMSOL

Meikandan, M.; Sundarraj, M.; Yogaraj, D.; Malarmohan, K

doi:10.1080/01430750.2018.1472650

Cited by 25 publications

(9 citation statements)

References 14 publications

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“…22 The primary chamber ranges in temperature from 800 0 F to 12000 0 F and the retention time in the primary chamber, which is varied by changing the rotation speed of the kiln, is approximately 30 minutes. 23,24 Off gases from the primary chamber pass into a secondary combustion chamber (Afterburner), this destroys any residual organics. 25 Gases from the secondary combustion chamber pass into a quench tank where they are cooled from approximately 2000 0 C to 200 0 C. From the quench tank, gases pass through a Venturi scrubber and a series of baghouse filters, which remove acid gases and particulates before releasing from the stack.…”

Section: Resultsmentioning

confidence: 99%

A Review on Residual Solid Propellant Disposal Methods Using HRIM, RISK Score Matrix, Safety Consequence Analysis and Environmental Impact Analysis

Meikandan

2022

Int J Occup Saf Health

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Introduction: Solid propellants are high energetic materials used for Launch vehicles and military applications. During solid propellant processing residual propellant generates due to less pot life, machining for insulation lining, scaled and sub scaled trials for mechanical and ballistic properties prediction. A conventional method for disposal of residual propellant is open-air burning; other alternate methods in the literature are incineration, wet air oxidation and molten salt destruction. Methods: Hazard assessment is carried out for the disposal methods both conventional and alternate. Preliminary hazard analysis (PHA), Hazard Risk Index Matrix (HRIM), Risk Score Matrix and as low as reasonably practicable (ALARP) are used to assess the Hazard. Results: Based on the study and calculations Open air burning is having less risk score and medium level safety risk acceptance and tolerable risk which can mitigate. Open-air burning is the safest, efficient and cost-effective way to dispose of the high energetic material but the disadvantage of this method is environmental pollution, high temperature and toxic gases exposure to fire personnel. Based on safety consequences analysis, the 1 gram of solid propellant is found to be 1.308 grams of Trinitrotoluene (TNT) equivalency, and one-time open burning creates 3.822 KPa overpressure on the atmosphere where minimum overpressure to create damage effect is 5 KPa. Conclusion: The environmental impact analysis for disposing of solid propellant gives information about different pollutants, their concentrations in the atmosphere at different altitudes and their impact. Solid propellants are hazard reactive materials they were the one exception under the Resource Conservation and Recovery Act (RCRA) that controls the destruction of hazardous waste.

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Section: Resultsmentioning

confidence: 99%

A Review on Residual Solid Propellant Disposal Methods Using HRIM, RISK Score Matrix, Safety Consequence Analysis and Environmental Impact Analysis

Meikandan

2022

Int J Occup Saf Health

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“…In Meikandan et al's study, on assessing the microhardness, kerf width, and surface roughness of Monel 400 superalloy, they measured experimentally the optimization of plasma arc cutting process parameters like stand-off distance between the plasma torch and work piece surface, pressure of the gas supplied, cutting velocity, and magnitude of arc current [20]. For the machining of innovative and hybrid materials, nontraditional machining technologies have risen in favor in industrial settings.…”

Section: Devaraj Et Al and Fountas Et Al Proposed A Simple Methods Of...mentioning

confidence: 99%

Optimization of Plasma Arc Cutting Parameters on Machining of Inconel 718 Superalloy

Karthick

Anand

Meikandan

et al. 2022

Journal of Nanomaterials

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Nickel-based super composites are widely applied in the industry. These alloys withstand high thermal debility conditions and give better strength to machine parts in aviation, biomechanical, marine, and vehicle commerce. Nickel-based alloys have high quality, corrosion resistance, and high heat refusal. Inconel 718 is one such composite extensively utilized in these loading circumstances because of chemical stability, mechanical friction, high thermal corrosion, and high stability. During the cutting procedure, these qualities will bring a lot of processing issues, for example, surface roughness, machining efficiency, and wear of tool. Plasma arc cutting (PAC) is an upsetting metal-cutting process to perform slicing of hard to cut materials even for complex profiles. The present work analyzes the impact of PAC process factors, for instance, gas pressure (GP), arc current (AC), cutting speed (CS), and stand-off distance (SOD) on assessing the kerf width (KW), kerf taper (KT), and heat-affected zone (HAZ) of Inconel 718 superalloy. This work deliberates about the cutting parameters required for the machining of Inconel 718 to provide least surface roughness and low instrument wear. The experiments conducted to validate the ingenuity of the process are in accordance with the optimal parameter settings necessary for machining purposes. The divergence from actuality has been extremely minimal with a relative error of 4.45% for kerf width and 4.36% for the extent of heat-affected zone postmachining.

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“…Reddy, Arepally, and Datta (2020) simulated the amount of heat flux on the bread surface as well as temperature profiles at different points of the bread during the baking process at 200 C. In addition, Al-Nasser, Fayssal, and Moukalled (2020) simulated heat and mass transfer in the three-dimensional and transient state in baking bread using natural and forced convection ovens, and they used the developed simulation to optimize the process of baking. Several other research teams have also tried to simulate and optimize the heat exchangers performance (Majdi, Alabdly, Hamad, Hasan, & Hatha, 2019;Meikandan, Sundarraj, Yogaraj, & Malarmohan, 2020;Yoon, Lee, Go, & Park, 2014).…”

Section: Introductionmentioning

confidence: 99%

Developing the new industrial flatbread baking system using numerical technique to increase the product quality

Bejaei

Seyedlou

Nalbandi

et al. 2021

J Food Process Engineering

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Bread is one of the most important food sources for consumers, especially in developing and underdeveloped countries. Large quantities of bread are wasted every year because different factors affect the quantity of waste products include flour quality, bread production technology, and the storage condition of the bread. The objective of this study was to improve existing systems and developed the new flatbread industrial baking machine to increase product quality and product storability. Therefore, a rotary bread baking machine with an indirect heating system was designed, and the heat exchangers of the machine were simulated. The results of the simulation were utilized to investigate the uniformity of airflow velocity inside the exchanger and the distribution of heat on the dough on the baking bed. After achieving the most effective design, the exchangers were constructed and installed inside the baking machine. Bread baking experiments with the developed machine and the existing conventional machines were conducted to evaluate the instrumental, sensory, and staling characteristics of the produced flatbreads from different baking machines. The results indicated that the sensory qualities of the bread produced with the indirect heating system in the present study as well as uniformity of baking and sensory acceptability were superior compared to the bread produced from the conventional industrial machines with direct heating systems (with a total sensory score of 5.09 vs. 4.54). Practical Applications In this research, a superior flatbread baking machine with indirect heat was designed, constructed, and evaluated. The flatbread baked with the indirect heating system had better quality scores and a longer shelf life compared to the flatbread baked with the direct heating system. This type of the flatbread lasted more than 168 hr without mold and it was the best choice for longer‐term storage purposes and for the reduction of food waste. Also, bread prepared using the new machine was free of any contaminants such as polycyclic aromatic hydrocarbons.

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Experimental and numerical investigation on bare tube cross flow heat exchanger-using COMSOL

Cited by 25 publications

References 14 publications

A Review on Residual Solid Propellant Disposal Methods Using HRIM, RISK Score Matrix, Safety Consequence Analysis and Environmental Impact Analysis

A Review on Residual Solid Propellant Disposal Methods Using HRIM, RISK Score Matrix, Safety Consequence Analysis and Environmental Impact Analysis

Optimization of Plasma Arc Cutting Parameters on Machining of Inconel 718 Superalloy

Developing the new industrial flatbread baking system using numerical technique to increase the product quality

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