Experimental investigation on thermo-hydraulic performance of Al2O3–water, CuO–water and MWCNT–water in a double-tube helically coiled heat exchanger
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Thermal hydraulics
Based on the influences of the material performance,the structure and processing requirements of the tube holes,the connection forms between the tubes and the tube sheets on the joint strength of the tubes and tube sheets,and on the fabrication of big E EA123F heat exchangers for ethylene,some reliable methods were proposed for the joint of the tubes and the tube sheets.
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Natural frequency in tube bundles is the basis of vibration analysis in the heat exchanger. The calculation methods of the natural frequency are summarized in four type of tube bundles: straight tube, U-bend tube, finned tube and tube-fin. The influence of structure, temperature and fluid on the natural frequency are analyzed. Some anti-vibration measures are also put forward. The research direction of vibration analysis in tube bundles of heat exchanger in the future has good prospects.
Natural frequency
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As compact and efficient heat exchange equipment, helically coiled tube-in-tube heat exchangers (HCTT heat exchangers) are widely used in many industrial processes.However, the thermal-hydraulic research of liquefied natural gas (LNG) as the working fluid in HCTT heat exchangers is rarely reported.In this paper, the characteristics of HCTT heat exchangers, in which LNG flows in the inner tube and ethylene glycol-water solution flows in the outer tube, are studied by numerical simulations.The influences of heat transfer characteristics and pressure drops of the HCTT heat transfers are studied by changing the initial flow velocity, the helical middle diameter, and the helical pitch.The results indicate that different initial flow velocities in the inner tube and the outer tube of the HCTT heat exchanger have little influence on the secondary flow of the fluid in the helical tubes, and the overall flow characteristics tend to be stable.The smaller helical middle diameter of the HCTT heat exchanger leads to the shorter fluid flow length, the smaller resistance along the tubes and the increase of initial pressure under the condition of constant inlet velocity, which promotes the occurrence of secondary flow.The axial flow of fluid promotes the destruction of heat transfer boundary layer and gains strength of the turbulence and heat transfer efficiency.With the increase of the helical pitch of the HCTT heat exchanger, the turbulent intensity and the heat transfer efficiency are also increased.Moreover, the improvement of the flow state of the HCTT exchanger in a longer helical pitch also enhances the heat exchange efficiency.
Thermal fluids
Thermal science
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This paper is concerned with brief study and real time
implementation of shell & tube (straight) heat exchanger
for analysis of different mechanical parameters involved
in it. The efficient analysis of these parameters enables
the knowledge of functioning and influence overall
thermo hydraulic performance. The impact of losses in
the system effects the design. So it is important to
consider the system losses while designing real time
apparatus. This paper depicts parameters and losses in
the shell and tube heat- exchanger. Result analysis via
real time shows the efficiency of existing model
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This paper demonstrates the implementation of intelligent controllers for the control of shell and tube heat exchanger. In order to optimize the future behavior of a shell and tube heat exchanger the fuzzy rules has been formed such that it accurately matches with the nominal operating ranges of heat exchanger. The fuzzy controller design is based on linguistic rules implementation as the control strategy. The intelligent controller produces response with greater performance than PID controller. The experiment is carried by manipulating the cold water inlet flow and temperature to the shell and tube heat exchanger.
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Abstract In this article, experimental analysis is done on shell‐and‐tube heat exchanger of a marine vessel for removal of fouling using optimum surface‐cleaning techniques. The main objective is to compare the performance of the heat exchanger before and after maintenance. Two identical deteriorated systems of heat exchangers are taken and real‐time analysis is conducted. The log data are taken before and after undergoing maintenance for the two systems. Two different cleaning techniques are used, namely, chemical cleaning and mechanical cleaning. Detailed calculations are made for the shell‐and‐tube heat exchanger. From the obtained data, comparisons are made for different parameters on the tube side such as friction factor, heat transfer coefficient and pressure drop, as well as total heat transfer rate on the shell side. From the analysis and comparison, it was found that greater heat transfer takes place for the tubes cleaned using the chemical cleaning method than for tubes cleaned by the mechanical cleaning method. Pressure drop is found to be less for chemical cleaning method than mechanical cleaning method. This indicates that the fouling effect is reduced for tubes cleaned by the chemical cleaning method, and furthermore these tubes remain corrosion‐resistant for longer periods of time.
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The purpose of this project is to develop and demonstrate the feasibility of a high-temperature sensor for on-line structural health monitoring (OLSHM) of the novel heat exchanger tubes in the Hydromine lead cooled reactor. The high temperature sensor takes advantage of the Hydromine heat exchanger tube design that has a relatively cool inlet temperature (~ 350 oC) and the tube ends are in an Argon gas blanket rather than being submerged in a corrosive fluid and the tube ends are conveniently accessible from the periphery of the heat exchanger shell.
Line (geometry)
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This study aims to develop and analyze the design of heat exchangers (HE) in the synthesis of PbO particles using a single precursor method. This type of HE shell and tube one-pass is designed to be simple. The specifications of HE equipment are shell length 1.5200 m, shell diameter 0.1361 m, outer tube diameter 0.0334 m, and thickness 0.0243 m. Then the calculation is done manually using the Microsoft Excel application. The results showed that the HE shell and tube design with the one pass type has a laminar flow, with an effective value of 84.66%. Therefore, this heat exchanger with shell and tube one meets the requirements and standards based on effectiveness, but without considering the fouling factor. The results of this analysis can be used as a learning medium in the design process, analysis of heat exchanger performance, and operating mechanisms.
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