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Sankar, N.
- A Comparative Study and Flow Analysis of Multiple Branch Pipe Flow Header used in Tube Heat Exchangers
Abstract Views :156 |
PDF Views:0
Authors
Affiliations
1 Sri Sairam Engineering College, Chennai, IN
1 Sri Sairam Engineering College, Chennai, IN
Source
Indian Journal of Science and Technology, Vol 9, No 48 (2016), Pagination:Abstract
Objectives: The aim of this paper is to increase the performance of heat exchangers. A flow header having number of small multiple branch pipes are commonly used in boilers and heat exchangers. In the beginning, the headers were designed to give equal flow distribution. But experimentally, it is not equal. In this paper, the uneven distribution of flow in the heat exchangers which affects the performance is rectified. Analysis Method: In this project, the flow distribution among the branch pipes of flow header is analyzed for two different geometrical flow nature (square and circular). The flow distribution are analysed with the use of CFD software. After analyzing the square and circular header tubes, the result values are compared with Osakabae’s laboratory experimental results. Result Extraction: Based on the result values, it is found that header shape will determine and by choosing the better shapes the performance of the Heat Exchanger can be increased and the fuel consumption can be reduced and can increase the total performance of the Boiler. Applications: The uniform flow distributions in the flow header definitely increase the performance of Heat exchangers.Keywords
Branch Pipes, Flow Header and Heat Exchanger, Headers, Non-Uniform.Full Text
- Mechanical Properties and Microstructural Characteristics of Rotating Arc Gas Metal Arc Welded Carbon Steel Joints
Abstract Views :283 |
PDF Views:1
Authors
Affiliations
1 Annamalai University, Annamalainagar (P.O), Tamilnadu, IN
1 Annamalai University, Annamalainagar (P.O), Tamilnadu, IN
Source
Manufacturing Technology Today, Vol 20, No 5-6 (2021), Pagination: 21-30Abstract
Low carbon steels are widely used in the manufacturing sectors due to their easy weldability than other carbon steels. Usually, the welding processes like shielded metal arc welding (SMAW), and gas metal arc welding (GMAW) are used for welding thick low carbon steel plates. Recently, a novel “rotary arc” or “spin arc” technique is developed with a rotary motion of filler wire that can change the flow of the weld puddle. In this investigation, an attempt has been made to join 12mm thick carbon steel plates made by stationary arc gas metal arc welding (SA-GMAW) and rotating arc gas metal arc welding (RA-GMAW) processes. The objective of present paper is to study the influence of rotating arc on mechanical properties and microstructural characteristics of GMA welded carbon steel joints. The results indicated that the arc rotation of GMAW process yielded 15% improvement in joint efficiency than the conventional stationary arc process.Keywords
Carbon Steel, Rotating Arc Welding, Tensile Properties, Impact Toughness and Microstructural Characteristics.
References
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- Effect of Rotatory Arc Welding Technology on Metallurgical and Mechanical Performance of Armour Grade Steel Joints
Abstract Views :195 |
PDF Views:4
Authors
Affiliations
1 Research Scholar, Centre for Materials Joining and Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalainagar, IN
2 Professor, Centre for Materials Joining and Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalainagar, IN
3 Professor, Head and Director, Centre for Materials Joining and Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalainagar, IN
4 Scientist, Combat Vehicles Research & Development Establishment (CVRDE), DRDO, Avadi, Chennai, IN
5 Outstanding Scientist, Combat Vehicles Research & Development Establishment (CVRDE), DRDO, Avadi, Chennai, IN
1 Research Scholar, Centre for Materials Joining and Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalainagar, IN
2 Professor, Centre for Materials Joining and Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalainagar, IN
3 Professor, Head and Director, Centre for Materials Joining and Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalainagar, IN
4 Scientist, Combat Vehicles Research & Development Establishment (CVRDE), DRDO, Avadi, Chennai, IN
5 Outstanding Scientist, Combat Vehicles Research & Development Establishment (CVRDE), DRDO, Avadi, Chennai, IN
Source
Indian Welding Journal, Vol 55, No 2 (2022), Pagination: 76-88Abstract
This work is aimed to investigate the arc rotation effect on mechanical properties and metallurgical characteristics of 18 mm thickness armour grade quenched and tempered (Q & T) steel joints. Mechanical properties like tensile, impact toughness and microhardness were evaluated from welded joints. Metallurgical characteristics of welded joints like macrostructure, microstructure, and weld metal chemical composition were analyzed. From the results, it is observed that the rotating arc gas metal welded (RTA-GMW) joint contain minimum heat affected zone width (1.8 mm) and exhibits better tensile properties (784 MPa) due to the decrease in heat density caused by arc rotation of the joining process. The impact toughness properties of weld joint showed 36 % improvement than the unwelded base metal. Microstructural studies also revealed higher volume percentage of fine delta ferrite (δ-Fe) with vermicular type δ-Fe morphological future in the weld joint. The rotation arc caused reduction in heat input, enhanced strength, impact toughness properties and creation of vermicular type δ-Fe morphology in armour grade Q&T steel welded joints.Keywords
Armour Steel, Rotating Arc Welding, Mechanical Properties, Metallurgical Behaviour.References
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