.... It is revealed that the height of the duct is an important parameter that should be included in damping criteria proposed for tube bundles of heat exchangers, as it controls the acoustic damping and radiation losses of the system, which have been over-looked in the past. References [1] Ziada , S...

..., hemispheroidal dimples exist on instant rupture zone. heat exchangers welded joint tube-to-tubesheet pullout force low cycle fatigue Heat exchangers are significant devices which are widely used in petroleum, petrochemical, pharmacy, and nuclear industries. More than 65% of heat exchangers used...

... of a tube sheet in heat exchangers. The saddle point condition can be expressed as ∇ L = 0 , where ∇ ( . ) without any index denotes the gradient in each direction. This condition leads to the following system of equations 18a ∇ x L = ∇ x f ( x...

...Natalia Petrova; Abdel-Hakim Bouzid Despite the fact that multipass shell-and-tube heat exchangers operating at high temperature are subject to frequent problems related to flange sealing, there is neither detailed explanations for the reasons of the failures nor an adequate solution...

...H. F. Wang; Z. F. Sang; G. E. O. Widera The fabrication of stainless steel tube-to-tubesheet joints of heat exchangers consists of welding after hydraulic expansion. Here, this process is simulated by use of the finite element method, which is carried out in a sequentially decoupled analysis...

...M. R. Jahangiri This work includes results of studies and experiments conducted on heat exchanger (heater) tubes of an energy production unit to determine the causes of their fractures. Experiments indicated that the main mechanism of such tube fractures is the simultaneous presence of relatively...

...A. N. Shuaib; O. M. Duffuaa; N. Merah; Y. Al-Nassar Heat exchanger tube rolling introduces tensile residual stresses in the expanded part of the tube and the transition zone between the expanded and unexpanded regions of the tube. These tensile residual stresses accelerate fatigue crack initiation...

...Stanley Yokell This paper discusses factory and field pressure testing of tubular heat transfer equipment such as closed feedwater heaters, steam surface condensers, and power plant auxiliary heat exchangers built in accordance with Section VIII, Division 1 of the ASME Boiler and Pressure Vessel...

...Hyeong-Yeon Lee; Kee-Nam Song; Yong-Wan Kim; Sung-Deok Hong; Hong-Yune Park A process heat exchanger (PHE) transfers the heat generated from a nuclear reactor to a sulfur-iodine hydrogen production system in the Nuclear Hydrogen Development and Demonstration, and was subjected to very high...

...Khosrow Behseta; Donald Mackenzie; Robert Hamilton An investigation of the cyclic elastic-plastic response of an Olefin plant heat exchanger subject to cyclic thermal and pressure loading is presented. Design by analysis procedures for assessment of shakedown and ratcheting are considered, based...

...Xiaoping Huang; Tian Xie The strength of tube-to-tubesheet joints is crucial for the joint integrity and reliability of the tubular heat exchangers. The joint strength measured by residual contact pressure is affected by several design parameters, such as the yield strength and strain hardening...

...Wei Wang; Liang Chen; Caidong Guo In order to investigate the strength design problem of the brazed aluminum plate-fin heat exchanger header under complex external piping loads, the limit load interactions of the header under combined piping loads are studied in this paper. To establish the limit...

... in single- and two-phase flows and fretting wear in process equipment, such as heat exchangers and steam generators. Connors critical velocity will be discussed as a measure of initiating fluidelastic instability. Vibro-impact of heat exchanger tubes and the random excitation by the cross-flow can produce...

...Ding Tang; Dayong Li; Yinghong Peng; Zhaohui Du This paper presents a study on the expansion process, which joins fins to thick-walled microgroove tubes for high pressure air conditioning and refrigeration (ACR) heat exchanger. Experiments of the tube expansion process have been carried out. An FE...

...M. J. Pettigrew; R. J. Rogers; F. Axisa This paper addresses the question of damping of multispan heat exchanger tubes with liquids (mostly water) on the shell side. The different energy dissipation mechanisms that contribute to damping are investigated. The available experimental data from...

... is a bare tube, which had the same base diameter as the finned tubes. The finned tubes under consideration were commercial finned tubes of a type typically used in the fossil and process industries. The addition of fins to tubes in heat exchangers enhances heat transfer due to the increased surface area...

...P. R. Vaidya; D. Narain; Sunil Kumar Tube-to-tube-sheet (TTS) welds, occurring in heat exchangers, condensers, and steam generators, are exempted from volumetric nondestructive examination, such as radiography or ultrasonic tests, due to their geometry. An approach of stricter quality control...

...A. Khalvatti; N. W. Mureithi; M. J. Pettigrew In operating shell-and-tube heat exchangers, tube vibration induced by cross-flow can be a serious problem. The region of concern in steam generators is the upper most U-bend region where the flow crosses a large number of tubes, which also cause...

... of the acoustic particle velocity for the onset of acoustic resonance in steam generator and tubular heat exchanger tube banks. 20 10 2009 16 06 2010 30 07 2010 30 07 2010 acoustic resonance boilers heat exchangers pipe flow pipes vortices In previous studies ( 1 2...

... corrugated and smooth double-tube heat exchangers were designed and tested under thermal loadings. Results show that the proposed formula for the stiffness weakness factor K f is accurate enough for the engineering application of the corrugated tubes in constructing heat exchangers. 20 10 2008 13...