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Rakesh Kumar - One of the best experts on this subject based on the ideXlab platform.
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transient Heat Flux Measurement analysis from coaxial thermocouples at convective based step Heat load
Numerical Heat Transfer Part A-applications, 2019Co-Authors: Sanjeev Kumar Manjhi, Rakesh KumarAbstract:The Measurement of surface Heating rate is an imperative parameter in the force convection ground-based facility for short duration investigation due to the Heat transfer rate is changing rapidly. ...
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transient surface Heat Flux Measurement for short duration using k type e type and j type of coaxial thermocouples for internal combustion engine
Measurement, 2019Co-Authors: Sanjeev Kumar Manjhi, Rakesh KumarAbstract:Abstract The surface Heat Flux Measurement in the internal combustion engine is imperious work, because the Heat transfer rate is changing very quickly during combustion process in the internal combustion engine and has very transitory Heat transfer in nature. Due to this, a fast response measuring thermal sensor is required to trace the Heating rate in the internal combustion engine. The coaxial thermocouples are appropriate to measure extremely transitory surface Heat Flux due to having the response time in the range of in millisecond or less and can invariantly use for short time observation facilities due to their meticulousness Measurements. The transient Heat Flux recovered from transient temperature is one of the conventional techniques and used in many engineering application such as internal combustion engine, aerodynamic vehicles cooling device, etc. In this existent exploration, the surface Heat Flux has measured of a four-stroke diesel engine at cylinder surface. In this backdrop, three (K-type, E-type and J-type) types of coaxial thermocouples have been contrived and calibrated to measure transient surface Heat Flux of engine cylinder. A field emission scanning electron microscopy (FESME) technique has been used for microstructural analysis of measuring the surface of these handmade coaxial thermocouples and an energy dispersive X-ray analysis (EDXA) technique used to qualitatively appraise of the coaxial surface junction thermocouples (CSJTs) materials composition. Using these coaxial thermocouples, the transient surface temperature has been recorded at four different experimental shot for short duration as well as its Heat Flux has been recovered using one-dimensional Heat conduction modelling for a semi-infinite body. The average value of surface Heat Flux recovered for all experiment have a reasonable deviation of 3% to each other and have 0.075% for transient surface temperature. This investigation states that these hand-made coaxial thermocouples are the efficient candidate to measure surface Heat Flux in the application internal combustion engine.
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Stagnation point transient Heat Flux Measurement analysis from coaxial thermocouples
Experimental Heat Transfer, 2018Co-Authors: Sanjeev Kumar Manjhi, Rakesh KumarAbstract:ABSTRACTThe transient Heat Flux Measurement at stagnation point is a significant solicitation at highly compressed flow field environment. In aerodynamics surface Heating point of view, the estimat...
Sanjeev Kumar Manjhi - One of the best experts on this subject based on the ideXlab platform.
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transient Heat Flux Measurement analysis from coaxial thermocouples at convective based step Heat load
Numerical Heat Transfer Part A-applications, 2019Co-Authors: Sanjeev Kumar Manjhi, Rakesh KumarAbstract:The Measurement of surface Heating rate is an imperative parameter in the force convection ground-based facility for short duration investigation due to the Heat transfer rate is changing rapidly. ...
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transient surface Heat Flux Measurement for short duration using k type e type and j type of coaxial thermocouples for internal combustion engine
Measurement, 2019Co-Authors: Sanjeev Kumar Manjhi, Rakesh KumarAbstract:Abstract The surface Heat Flux Measurement in the internal combustion engine is imperious work, because the Heat transfer rate is changing very quickly during combustion process in the internal combustion engine and has very transitory Heat transfer in nature. Due to this, a fast response measuring thermal sensor is required to trace the Heating rate in the internal combustion engine. The coaxial thermocouples are appropriate to measure extremely transitory surface Heat Flux due to having the response time in the range of in millisecond or less and can invariantly use for short time observation facilities due to their meticulousness Measurements. The transient Heat Flux recovered from transient temperature is one of the conventional techniques and used in many engineering application such as internal combustion engine, aerodynamic vehicles cooling device, etc. In this existent exploration, the surface Heat Flux has measured of a four-stroke diesel engine at cylinder surface. In this backdrop, three (K-type, E-type and J-type) types of coaxial thermocouples have been contrived and calibrated to measure transient surface Heat Flux of engine cylinder. A field emission scanning electron microscopy (FESME) technique has been used for microstructural analysis of measuring the surface of these handmade coaxial thermocouples and an energy dispersive X-ray analysis (EDXA) technique used to qualitatively appraise of the coaxial surface junction thermocouples (CSJTs) materials composition. Using these coaxial thermocouples, the transient surface temperature has been recorded at four different experimental shot for short duration as well as its Heat Flux has been recovered using one-dimensional Heat conduction modelling for a semi-infinite body. The average value of surface Heat Flux recovered for all experiment have a reasonable deviation of 3% to each other and have 0.075% for transient surface temperature. This investigation states that these hand-made coaxial thermocouples are the efficient candidate to measure surface Heat Flux in the application internal combustion engine.
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Stagnation point transient Heat Flux Measurement analysis from coaxial thermocouples
Experimental Heat Transfer, 2018Co-Authors: Sanjeev Kumar Manjhi, Rakesh KumarAbstract:ABSTRACTThe transient Heat Flux Measurement at stagnation point is a significant solicitation at highly compressed flow field environment. In aerodynamics surface Heating point of view, the estimat...
Tom E. Diller - One of the best experts on this subject based on the ideXlab platform.
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Heat Flux Measurement
Mechanical Engineers' Handbook, 2015Co-Authors: Tom E. DillerAbstract:This chapter reviews the most useful current Heat Flux instrumentation, particularly Heat Flux gauges. It also briefly discusses the optical methods, but these are generally research methods that require sophisticated equipment and data processing techniques. General principles for the proper use of Heat Flux gauges are discussed first, followed by the details of specific gauges along with some of their typical applications. Three classifications of gauges are considered based on measured temperature difference over space, the temperature change with time, and the power dissipated at a maintained temperature. The Measurement methods are also categorized according to the type of temperature Measurement. The three common techniques are thermocouples, resistance temperature devices (RTDs), and optical. Finally, the chapter discusses the calibration of Heat Flux gauges along with error analysis. There are a number of problems and complications that should be taken into account while planning for any Heat Flux Measurements. Keywords: calibration; error analysis; Heat Flux gauges; Heat Flux Measurement; optical methods; resistance temperature devices (RTDs); thermocouples
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Handbook of Measurement in Science and Engineering - Heat Flux Measurement
2013Co-Authors: Tom E. DillerAbstract:This chapter reviews the most useful current Heat Flux instrumentation, particularly Heat Flux gauges. It also briefly discusses the optical methods, but these are generally research methods that require sophisticated equipment and data processing techniques. General principles for the proper use of Heat Flux gauges are discussed first, followed by the details of specific gauges along with some of their typical applications. Three classifications of gauges are considered based on measured temperature difference over space, the temperature change with time, and the power dissipated at a maintained temperature. The Measurement methods are also categorized according to the type of temperature Measurement. The three common techniques are thermocouples, resistance temperature devices (RTDs), and optical. Finally, the chapter discusses the calibration of Heat Flux gauges along with error analysis. There are a number of problems and complications that should be taken into account while planning for any Heat Flux Measurements. Keywords: calibration; error analysis; Heat Flux gauges; Heat Flux Measurement; optical methods; resistance temperature devices (RTDs); thermocouples
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Heat Flux Measurement
Handbook of Measurement in Science and Engineering, 2013Co-Authors: Tom E. DillerAbstract:Owing to the importance of energy in modern society, Heat transfer (the movement of thermal energy) has become a crucial factor in many engineering systems. Measurements of Heat transfer are therefore important, but remain a challenge to accomplish with accuracy. Various commercial Heat Flux gages and research methods are available to measure Heat transfer in a wide range of applications. This chapter explores how to accurately and reliably measure Heat Flux (Heat transfer per area) with these techniques in practical situations. Keywords: calorimeter; calibration; differential thermocouple; energy transfer; frequency response; Heat Flux gage; response time; RTD; sensor; temperature; thermoelectric
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in situ high temperature Heat Flux sensor calibration
International Journal of Heat and Mass Transfer, 2010Co-Authors: Clayton A. Pullins, Tom E. DillerAbstract:Abstract Recent advances in Heat Flux Measurement have resulted in the development of a robust thermopile Heat Flux sensor intended for use in extreme thermal environments. The High Temperature Heat Flux Sensor (HTHFS) is capable of simultaneously measuring thermopile surface temperature and Heat Flux at sensor temperatures up to 1000 °C. The need for high temperature Heat Flux calibration of the HTHFS has resulted in the development of a new wide angle radiation calibration system, which operates with the sensor at elevated temperatures. The temperature dependence of the sensor output over the range of 100–900 °C has been successfully characterized with acceptable uncertainty limits. The calibrated HTHFS sensitivity agrees well with a theoretical sensitivity model, suggesting that the primary cause for the sensor’s output temperature dependence is due to the change in thermal conductivity of the sensor elements with temperature.
Jesús Ballestrín - One of the best experts on this subject based on the ideXlab platform.
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hybrid Heat Flux Measurement system for solar central receiver evaluation
Energy, 2004Co-Authors: Jesús Ballestrín, R MonterrealAbstract:A hybrid Heat Flux Measurement system has been designed, built and mounted on top of the SSPS-CRS tower at the Plataforma Solar de Almeria (PSA) to measure the incident solar power that is concentrated by a heliostat field on the flat aperture of a central receiver. This device is composed of two Measurement systems, one direct and the other indirect. Each direct system component, and in particular, the Heat Flux microsensors, which enable these Measurements to be made in a few seconds without water-cooling, are described. The indirect system is based on a CCD camera that uses a water-cooled Heat Flux sensor as a reference for converting gray-scale levels into Heat Flux values. The main objective is to systematically compare both Measurements of the concentrated solar power in order to increase the confidence in its es timation. At the present time, everything is prepared for Heat Flux Measurements on the aperture of solar receiver prototypes. The incident solar power and the spatial Heat Flux distribution on the aperture of the HitRec II volumetric receiver are provided by the above-mentioned hybrid system. The two Measurements are compared in detail showing their good agreement.
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A non-water-cooled Heat Flux Measurement system under concentrated solar radiation conditions
Solar Energy, 2002Co-Authors: Jesús BallestrínAbstract:This paper presents a brief description of a direct Heat Flux Measurement system to measure the concentrated solar power delivered by a heliostat field onto the flat aperture of solar central receiver prototypes. The main advantages of this device are the low Measurement uncertainty and the non-requirement of water-cooling. This system has been designed, mounted and used successfully on top of the SSPS-CRS tower at the Plataforma Solar de Almeria (PSA). The concentrated solar power and the spatial Heat Flux distribution, onto the aperture of a volumetric receiver prototype under evaluation, have been determined by the above-mentioned system.
Gerhard Winter - One of the best experts on this subject based on the ideXlab platform.
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evaluation of Heat Flux Measurement as a new process analytical technology monitoring tool in freeze drying
Journal of Pharmaceutical Sciences, 2017Co-Authors: Ilona Vollrath, Victoria Pauli, Wolfgang Friess, Angelika Freitag, Andrea Hawe, Gerhard WinterAbstract:This study investigates the suitability of Heat Flux Measurement as a new technique for monitoring product temperature and critical end points during freeze drying. The Heat Flux sensor is tightly mounted on the shelf and measures non-invasively (no contact with the product) the Heat transferred from shelf to vial. Heat Flux data were compared to comparative pressure Measurement, thermocouple readings, and Karl Fischer titration as current state of the art monitoring techniques. The whole freeze drying process including freezing (both by ramp freezing and controlled nucleation) and primary and secondary drying was considered. We found that direct Measurement of the transferred Heat enables more insights into thermodynamics of the freezing process. Furthermore, a vial Heat transfer coefficient can be calculated from Heat Flux data, which ultimately provides a non-invasive method to monitor product temperature throughout primary drying. The end point of primary drying determined by Heat Flux Measurements was in accordance with the one defined by thermocouples. During secondary drying, Heat Flux Measurements could not indicate the progress of drying as monitoring the residual moisture content. In conclusion, Heat Flux Measurements are a promising new non-invasive tool for lyophilization process monitoring and development using energy transfer as a control parameter.
