Implementation of one and three dimensional models for heat transfer coeffcient identification over the plate cooled by the circular water jets

Malinowski, Z.; Cebo-Rudnicka, A.; Hadała, B.; Szajding, A.; Telejko, T.

doi:10.1007/s00231-017-2195-0

Cited by 13 publications

(4 citation statements)

References 39 publications

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“…Nallathambi and Specht [20] used the two-dimensional nite element method to estimate the heat ux during the metal quenching process using an array of jets. Z. Malinowski et al [21] developed an inverse method to determine three-dimensional heat ux and heat transfer coe cient distributions in space and time over a metal surface cooled by water.…”

Section: Inverse Heat Conduction Methodsmentioning

confidence: 99%

Analysis of the local Heat Transfer of Quenching moving Metal Sheets made of different materials using Flat Spray Nozzles

Mehdi

Ryll

Specht

2023

Preprint

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Experimental investigations have been performed for the cooling of hot moving metal sheets of thickness 2 mm and 5 mm with the initial temperature of 500°C to 800°C by two flat spray nozzles. Tap water at room temperature is used as a coolant. Experiments are carried out for nickel, nicrofer, and aluminum alloy AA6082 with varying sheet velocity ( 5,10,15 mm/s) and nozzle inclination angle (45°,65°,90°). The temperature distribution on the backside of the sheet during the cooling is recorded with a high-speed infrared camera. The recorded thermal data are used in the inverse heat conduction analysis to estimate the local heat fluxes and temperatures on the quenched surface. The thermal images obtained are used to analyze the length of the pre-cooling, transition boiling, and nucleate boiling. The maximum heat flux, the DNB temperature, and the rewetting temperature are presented for researched parameters. The nozzle inclination angle has a weak influence. The higher the velocity and the thickness of the sheet are, the higher the maximum heat flux and the shorter the pre-cooling region. The reason is that the position of the max. heat flux is shifted downstream near to impingement region.

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Section: Inverse Heat Conduction Methodsmentioning

confidence: 99%

Analysis of the local Heat Transfer of Quenching moving Metal Sheets made of different materials using Flat Spray Nozzles

Mehdi

Ryll

Specht

2023

Preprint

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“…In this case, the heat conduction model could be simplified to one dimension. [ 27 ] The heat loss caused by the sidewall and heat radiation were ignored. Therefore, the thermal differential correlation is given by Equation (7).…”

Section: Methodsmentioning

confidence: 99%

Effect of Surfactants on Liquid–Solid Heat Transfer on High‐Temperature Wall

Tian

Wang

et al. 2020

steel research int.

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During the quenching of high‐temperature steel plate, Leidenfrost phenomenon takes place, which prevents the coolant from extracting heat from high‐temperature wall. Adding surfactant to the basic fluid can reduce the surface tension, increase the solid–liquid contact area, and ultimately increase the cooling speed. Herein, aqueous solutions of 240 ppm cetyl trimethyl ammonium bromide (CTAB), 600 ppm sodium dodecyl sulfate (SDS), and 56 ppm polyoxyethy‐lene (20) sorbaitan monolaurate (Tween‐20) are used as coolants. Using a 50 mm thick high‐temperature AISI304 stainless steel plate, free surface jet experiments are designed and completed to study the influence of different coolants on the surface heat transfer and internal thermal conductivity. The experimental results show that surfactants can reduce the surface tension, which enhance the wettability of the fluid on the surface, whereas the time it takes for the fluid to completely wet the experimental region is shortened by up to 13.87%. The foaming can increase the width of wetting front and hinder the expansion speed of the wetted region. When aqueous Tween‐20 with low surface tension and low foaming is used as the coolant, the maximum heat flux increases by 12.11%, 7.03%, 9.33%, 7.70%, and 4.41% compared with that of pure water.

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“…The HTC and the heat flux distributions at the plate surface have been determined in time and space by experiments. 8 The effect of changing the diameter of the nozzle supplying cooling water on boiling heat transfer has been investigated numerically. 9 So the simulated method helped research the heat transfer characteristics of new equipment, and the experimental method could be applied to verify the simulation results.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer characteristics and cooling capacity of online quenching equipment for plate

Shi,

Yang,

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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The finite element method was taken to simulate the heat transfer characteristics and capacity of the online cooling equipment of a 3500 mm medium thickness plate production line. The cooling field on the steel plate surface could be divided into the impact zone and the wall jet zone after cooling water was sprayed on the surface of the steel plate. The impact zone had an intense heat transfer capacity because of the static pressure and the high radial velocity of cooling water. The maximum heat transfer coefficient (HTC) in the impact zone of spray and laminar cooling equipment could reach 20,334 and 10,096 W/(m2 °C), respectively. In the wall jet zone, the radial velocity of cooling water was the main factor affecting the heat transfer capacity. With the decrease in velocity, the HTC decreased gradually. There is a linear relationship between the average HTC and the water flow. The average HTCs of spray and laminar cooling equipment in the common range of water flow were 5904–7255 W/(m2 °C) and 3012–3369 W/(m2 °C), respectively. The HTCs were verified in the 3500 mm medium thickness plate production line.

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Implementation of one and three dimensional models for heat transfer coeffcient identification over the plate cooled by the circular water jets

Cited by 13 publications

References 39 publications

Analysis of the local Heat Transfer of Quenching moving Metal Sheets made of different materials using Flat Spray Nozzles

Analysis of the local Heat Transfer of Quenching moving Metal Sheets made of different materials using Flat Spray Nozzles

Effect of Surfactants on Liquid–Solid Heat Transfer on High‐Temperature Wall

Heat transfer characteristics and cooling capacity of online quenching equipment for plate

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