Fouling and its effect on the thermal performance of heat exchanger tubes

Sarma, P. K.; Konijeti, Ramakrishna; Subramanyam, T. K.; Prasad, Lankapalli; Sharma, K.V.; Srinivas, V.; Vedula, Dharma Rao; Prasad, Veerapanen

doi:10.18280/ijht.350307

Cited by 19 publications

(12 citation statements)

References 18 publications

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“…With the growth of pressure, the local peak showed a decreasing trend, and ceased to exist once the pressure reached 31MPa. Figure 9 is a 3D diagram of the correlations of thermal conductivity with temperature (375 0 C~390 0 C) and pressure (32MPa~35MPa) [7]. Overall, the thermal conductivity is negatively correlated with the temperature, and positively with the pressure.…”

Section: Change Law Of Thermal Conductivitymentioning

confidence: 98%

Supercritical cyclic steam stimulation of wellbore temperature and pressure distribution in Lukeqin oilfield

Zhang¹,

Liu²

2018

IJHT

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This paper aims to optimize the injection temperature and pressure of supercritical steam. For this purpose, the author acquired the variations of the supercritical steam parameters (i.e. density, viscosity, thermal conductivity, enthalpy and specific heat) with temperatures and pressures, plotted the 3D diagrams of the variation patterns, and performed surface fittings of the results. On this basis, the calculation formulas were put forward for the physical parameters of steam under changing temperature and pressure. According to the theories of heat transfer, thermodynamics and fluid mechanics, a mathematical model of wellbore temperature and pressure was created for supercritical cyclic steam simulation (CSS), and discretized the calculation formulas by node analysis. Based on the model, a computation software was compiled for supercritical CSS, and applied to calculate the variation in wellbore temperature and pressure with well depths. The results show that the calculated temperature of wellbore steam decreased linearly, while the calculated pressure of the steam increased linearly, with the increase of well depth. Through comparison, the calculated results were found to be consistent with the distribution curves of the test results. The error between the two sets of results is extremely small. The research findings shed new light on the design and optimization of supercritical CSS parameters.

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Section: Change Law Of Thermal Conductivitymentioning

confidence: 98%

Supercritical cyclic steam stimulation of wellbore temperature and pressure distribution in Lukeqin oilfield

Zhang¹,

Liu²

2018

IJHT

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“…• Cooler #1 outlet water temperature exceeded 315 K, which almost duplicates fouling on the water-side [4,6,25]. This trend was less noticeable in cooler #2, where only 1.67% of the measurements exceeded such temperature.…”

Section: Evaluation Of the Heat Exchangers Under Current Operating Comentioning

confidence: 99%

Improvements to the Heat Transfer Process on a Hydrogen Sulphide Gas Coolers System

Escalona¹,

Góngora-Leyva²

2019

IJHT

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To operate the hydrogen sulphide gas coolers outside design parameters impacts the production process, because the resulting increased gas outlet temperature and lower sulphur separation effectiveness, which favors pipe plugging and damage to downstream compressors. A procedure was formulated for thermal analysis of jacketed shell-and-tube heat exchangers, in order to examine the object of study and propose improvements to existing facilities. Beyond conventional analysis, this work included the experimental method as well as mathematical modeling, that were not interrelated in previous researches. A cooling system that meets current technological requirements was identified, consisting of two sets of four improved coolers, where each set operates at a maximum hydrogen sulphide flowrate of 5.565 kg/s and 7.500 kg/s of water feeding each exchanger, thus reaching a gas cooling rate below 313 K.

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“…Heat exchangers are inevitable devices that are being employed in various home appliances and industries. But conventional configurations of heat exchanging devices are no longer dominant for transferring heat between hot and cold streams and fouling is also common phenomena which effects the rate of heat transfers through the tubes of the heat exchanger . Hence, design improvements in the configurations of heat exchangers are necessary to obtain compact configurations and process intensification in modern heat exchangers.…”

Section: Introductionmentioning

confidence: 99%

“…But conventional configurations of heat exchanging devices are no longer dominant for transferring heat between hot and cold streams and fouling is also common phenomena which effects the rate of heat transfers through the tubes of the heat exchanger. 1 Hence, design improvements in the configurations of heat exchangers are necessary to obtain compact configurations and process intensification in modern heat exchangers. Boothroyd 2 proposed the countercurrent spirally arranged ducts which enables larger areas for heat exchanges in a small volume.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer enhancement using hybrid nanofluids in spiral plate heat exchangers

Returi

Konijeti

Dasore

2019

Heat Trans. Asian Res.

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A possible way to enhance the rate of heat transfer in the spiral plate heat exchanger (SPHE) is by employing hybrid nanofluids as its working medium. Hence, in the present work, effects of hybrid nanofluids on the thermal performance of SPHE has been investigated numerically. First, a countercurrent SPHE is designed and modeled. Later, simulation of SPHE has been carried out by employing conventional fluid (H2normalOnormal), nanofluids (Al2normalO3)/normalH2O,normalCnormalunormalO/normalH2O,normalTnormaliO2/normalH2O), and hybrid nanofluids (Al2normalO3+normalCnormalunormalO/normalH2O,Anormall2normalO3+normalTnormalinormalO2/normalH2O) to investigate the heat transfer rates. Finally, the performance of SPHE using hybrid nanofluid is compared with that of using water and nanofluids. The heat transfer augmentation of approximately 16%‐27% with hybrid nanofluids of overall 4% nanoparticles volume concentration and 10%‐16% with 2% nanoparticles volume concentration is observed when compared with that of pure water. Therefore, it can be inferred that the application of hybrid nanofluids in SPHE seems to be one of the promising solutions for augmentation of its thermal performance.

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Fouling and its effect on the thermal performance of heat exchanger tubes

Cited by 19 publications

References 18 publications

Supercritical cyclic steam stimulation of wellbore temperature and pressure distribution in Lukeqin oilfield

Supercritical cyclic steam stimulation of wellbore temperature and pressure distribution in Lukeqin oilfield

Improvements to the Heat Transfer Process on a Hydrogen Sulphide Gas Coolers System

Heat transfer enhancement using hybrid nanofluids in spiral plate heat exchangers

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