Results 1 to 10 of about 146,644 (262)

Investigation of expansion percentages and groove inclusions on the performance of welded, expanded, welded-expanded tube-to-tubesheet joints

Journal of Materials Research and Technology, 2023
Tube-to-tubesheet joints play a crucial role in providing structural integrity to the shell and tube heat exchangers. This research investigated the combined effect of roller expansion percentages and grooves on the performance of expanded and welded ...
Dinu Thomas Thekkuden, Abdel-Hamid Ismail Mourad, Abdel-Hakim Bouzid, Muhammad M. Sherif   +3 more
doaj   +3 more sources

Physics of notochord tube expansion in ascidians [PDF]

Proceedings of the National Academy of Sciences
Interaction of cells and the surrounding lumen drives the formation of tubular system that plays the transport and exchange functions within an organism. The physical and biological mechanisms of lumen expansion have been explored. However, how cells communicate and coordinate with the surrounding lumen, leading to continuous tube expansion to a ...
Wenjie Shi, Charlie Duclut, Yan Xu, Yuanting Ma, Jinghan Qiao, Boyan Lin, Dongyu Yang, Jacques Prost, Bo Dong   +8 more
openaire   +3 more sources

Tube Drawing Process with Diameter Expansion for Effectively Reducing Thickness

Metals, 2020
The present paper describes a tube drawing method with diameter expansion, which is herein referred to as “expansion drawing”, for effectively producing thin-walled tube. In the proposed method, the tube end is flared by pushing a plug into the tube, and
Shohei Kajikawa, Hikaru Kawaguchi, Takashi Kuboki, Isamu Akasaka, Yuzo Terashita, Masayoshi Akiyama   +5 more
doaj   +3 more sources

The Role of the Process and Design Variables in Improving the Performance of Heat Exchanger Tube Expansion

Applied Sciences, 2018
In the expansion process of a fin-tube heat exchanger, the process variables and shape of the expansion ball affect the deformation of the tube’s inner grooves, the adhesion, and the expansion force.
Changwan Han, Inchul Sin, Hyerin Kwon, Seonghun Park   +3 more
doaj   +3 more sources

Mechanical behavior and energy absorption of expansion circular tube with negative Poisson’s ratio

Alexandria Engineering Journal
The expansion tube plays a crucial role in the field of train collision safety protection. In this study, we combine the expansion characteristics of negative Poisson’s ratio (NPR) with the deformation mechanism of the expansion tube to propose a novel ...
Ruixian Qin, Xiwei Liu, Xi Wang, Hongzhe Niu, Qijian Li, Xu Zhang, Bingzhi Chen   +6 more
doaj   +3 more sources

A new methodology for detecting adhesion location in aluminum tube expansion

Advances in Mechanical Engineering, 2017
During the expansion forming of aluminum tube, the efficiency of heat exchanger diminishes due to the adhesion of groove and expansion ball inside the tube.
Hyerin Kwon, Kwang-Hoon Kim, Changwan Han, Seonghun Park   +3 more
doaj   +2 more sources

The Fourier type expansions on tubes [PDF]

Complex Variables and Elliptic Equations, 2020
In view of recent developments of the study of reproducing kernel Hilbert spaces, in particular with the context the Hardy spaces on tubes, aspects of rational approximation for functions of finite energy in several complex and several real variables are developed.
Mai, Weixiong, Qian, Tao
openaire   +2 more sources

Tube Expansion by Single Point Incremental Forming: An Experimental and Numerical Investigation

Metals, 2021
In this paper, we revisit the formability of tube expansion by single point incremental forming to account for the material strain hardening and the non-proportional loading paths that were not taken into consideration in a previously published ...
Carlos Suntaxi, Gabriel Centeno, M. Beatriz Silva, Carpóforo Vallellano, Paulo A. F. Martins   +4 more
doaj   +1 more source

Effect of Tube Expansion on Heat Transfer and Pressure Drop Characteristics During Condensation in Micro-Fin Tubes

Frontiers in Energy Research, 2021
Despite of the large number of research dedicated to condensation heat transfer and pressure drop characteristics in pristine micro-fin tubes, experimental investigation on effects of tube expansion have not been reported in the open literature.
Na Liu, Qian Zhao, Zhixiang Lan
doaj   +1 more source

Combined effect of tungsten inert gas welding and roller expansion processes on mechanical and metallurgical characteristics of heat exchanger tube-to-tubesheet joints

Journal of Materials Research and Technology, 2022
Tube-to-tubesheet joints are one of the major vulnerable locations prone to cracks in heat exchangers. The manufacturing processes of these joints have an important role in providing structural integrity to the heat exchangers. The main objective of this
Dinu Thomas Thekkuden, Abdel-Hamid Ismail Mourad, Tholkappiyan Ramachandran, Abdel-Hakim Bouzid, Ravi Kumar, Ahmed Alzamly   +5 more
doaj   +1 more source