Transient Heat Transfer Study of Direct Contact Condensation of Steam in Spray Cooling Water

Hu, Yunfa; Huang, Qunwu; Cui, Yong

doi:10.1007/s12209-017-0106-6

Cited by 5 publications

(3 citation statements)

References 26 publications

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“…Chen et al 9 found that high steam temperature, low steam flow rate, low cooling water inlet temperature, and high cooling water flow rate helped to promote steam condensation by conducting condensation experiments in a cocurrent flow tower. Wang et al 10 conducted an experimental study on the transient condensation of steam containing noncondensable gas in a condensing tower and showed that increasing the cooling water flow rate significantly improved the heat transfer coefficient, but reducing the subcooled water temperature had a limited effect on steam condensation. Ding et al 11 investigated the effect of water film breakage on condensation by constructing a two‐dimensional axisymmetric rotational model in computational fluid dynamics (CFD), and the results showed that cooling water flow rate, cooling water temperature, and steam temperature all had an effect on the breakage length of the water film.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of direct contact condensation of spent vapor in a cocurrent flow packed tower under negative pressure

Guo²,

Peng

et al. 2023

Energy Science & Engineering

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Condensers are often required in power generation systems to condense the exhaust steam generated at the end of the turbine. This paper will investigate the enhanced condensation process of spent steam in a parallel flow type. The operating parameters of steam temperature (Tcond), steam flow rate (Gin), cooling water temperature (Tin), and cooling water flow rate (Lw) will affect the condensation effect by changing the gas–liquid arrangement in the tower. In this experiment, an orthogonal test was designed in the Raschig ring to investigate the significance of these four operating parameters on the experimental results. Different types of packings have different condensation effects due to different accumulation methods. The same type of packing has a different surface area, resulting in different contact areas between the gas and liquid phases during condensation. In this experiment, four different packings will be investigated to find their condensation performance. This paper uses the size of subcooling (ΔT) as an indicator to evaluate the effectiveness of condensation, and the values of condensation rate (R), number of liquid phase heat transfer units (NTUL), and total volume heat transfer coefficient (Kv) are used as a reference for the effectiveness of condensation. The results show that the overall condensation effect of regular packing is better than that of random packing, The average condensation rate of regular packing is 95%, the average condensation rate of random packing is 90%, the subcooling of regular packing is about three to five smaller than that of random packing, the heat transfer coefficient of regular packing is about 1.5 times of that of random packing. And by fitting the Kv data for different packings, an empirical formula was obtained that can be used to predict the Kv size of other packings.

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Section: Introductionmentioning

confidence: 99%

Experimental study of direct contact condensation of spent vapor in a cocurrent flow packed tower under negative pressure

Guo²,

Peng

et al. 2023

Energy Science & Engineering

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“…Furthermore, many investigators aimed at conducting research on the cooling of superheated steam. Wang et al [14] conducted a transient experiment to investigate the condensation of steam by direct contact with cooling water. The condensation performance increased when the mass flow rate of the cooling water increased appropriately, while the temperature of the cooling water did not play an important role.…”

Section: Introductionmentioning

confidence: 99%

A numerical study of heat transfer effects and aerodynamic noise reduction in superheated steam flow passing a temperature and pressure regulation valve

Qian

Chen

Jin

et al. 2020

Numerical Heat Transfer, Part A: Applications

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Steam is a common medium in thermal engineering. When it flows through a throttling element, the aerodynamic noise may occur due to the disturbance. In this investigation, superheated steam flowing through a Venturi tube, one of the main parts in a temperature and pressure regulation valve, at different thermal conditions is studied to analyze to effects of heat transfer on the acoustic power. With a high temperature and a low pressure, the superheated steam is treated as ideal gas. The flow velocity is high, so the k-epsilon turbulent model is used, with the compressible steam. The results show that under the adiabatic condition, the acoustic power mainly influenced by the turbulent characteristics, such as the dissipation rate and the turbulent kinetic energy. Comparing the acoustic power levels at different thermal conditions, it is found that a lower temperature results to a lower acoustic power.

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“…The cooling water can take away heat when it flows through the channel [15]. For example, a high-power motor's water cooling radiating system [16], which adopts the approach of a cooling water jacket enclosing the motor stator, is motor radiating, whose coolant galleries mainly have a Z-shaped circumference [17], spiral-shaped circumference [18], half-spiral-shaped circumference [19], Z-shaped axial direction [20], and so on [21]. When the cooling water jacket is static, temperature field simulation can be carried out if the relevant conditions, such as cooling water flow or speed are given [22].…”

Section: Introductionmentioning

confidence: 99%

Flow Field and Temperature Field of Water-Cooling-Type Magnetic Coupling

Wang

Jia

Zhu

et al. 2019

Chin. J. Mech. Eng.

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At present, the water-cooling simulation of the water-cooled magnetic coupler is based on the water-cooled motor and the hydraulic coupler, which cannot accurately characterize the temperature distribution of the rotating watercooled coupling of the coupler. Focusing on rotating water cooling radiating, the present paper proposes simulating the water cooling temperature field as well as the flow field through the method of combining fluid-solid coupled heat transfer and MRF (Multiphase Reference Frame). In addition, taking an 800 kW magnetic coupling as an example, the paper optimizes the shape, number, cooling water inlet speed‚ and so on‚ of the cooling channel. Considering factors such as the complete machine's temperature, and drag torque, it is proved that the cooling effect is best when there are 36 involute curved channels and when the inlet speed is 3 m/s. Further, through experiments, the actual temperature values at six different positions when 50 kW and 70 kW thermal losses differ are measured. The measured values agree with the simulation results, proving the correctness of the proposed method. Further, data have been collected during the entire experimental procedure‚ and the variation in the coupling's temperature is analyzed in depth, with the objective of laying a foundation for the estimation of the inner temperature rise as well as for the optimization of the structural design.

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Transient Heat Transfer Study of Direct Contact Condensation of Steam in Spray Cooling Water

Cited by 5 publications

References 26 publications

Experimental study of direct contact condensation of spent vapor in a cocurrent flow packed tower under negative pressure

Experimental study of direct contact condensation of spent vapor in a cocurrent flow packed tower under negative pressure

A numerical study of heat transfer effects and aerodynamic noise reduction in superheated steam flow passing a temperature and pressure regulation valve

Flow Field and Temperature Field of Water-Cooling-Type Magnetic Coupling

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