CFD Modeling of Jet Impingement during Heating and Cooling of Foods

2007 ◽  
pp. 505-522
Keyword(s):  
Jet Impingement ◽  
Cfd Modeling ◽  
Heating And Cooling

CFD Modeling of Thermal Management Systems for a Silicon Semiconductor Switch

2020 ◽  
Author(s):  
Jordan N. Berg ◽  
Sarvenaz Sobhansarbandi
Keyword(s):  
Thermal Management ◽  
Fluid Dynamic ◽  
Jet Impingement ◽  
Liquid System ◽  
Pulse Power ◽  
Cfd Modeling ◽  
Inlet Temperature ◽  
Ansys Fluent ◽  
Term Operation ◽  
Semiconductor Switches

Abstract Silicon semiconductor switches are suitable for pulse power applications. When utilized in these applications, the switch receives a significant amount of power (i.e., heat) that is to be dissipated, which can result in the degradation of the switch. In order to maintain the functionality of the switch, a thermal management system (TMS) needs to be developed to keep the switch temperature at no higher than 80 °C during operation. This threshold is set due to an increase in electrical resistivity of silicon with an increase in temperature. This study compares the viability of two TMS, a microchannel and a jet impingement single-phase liquid system, to facilitate the long term operation of the switch for pulse power applications through performing computational fluid dynamic modeling (CFD) in ANSYS Fluent. The results from this study show that by utilizing a jet impingement system as TMS, the temperature of switch is maintained below the desired operating temperature when compared to that of the microchannel design under identical operating parameters (i.e., mass flow rate, coolant type and inlet temperature). Moreover, a cross validation of the thermal performance of the proposed systems has been made to further validate the obtained results.

CFD Conjugate Analysis of a Jet-Impingement Configuration With Sudden Changes in Heating and Cooling Loads

2013 ◽  
Author(s):  
C.-S. Lee ◽  
T. I-P. Shih ◽  
K. M. Bryden
Keyword(s):  
Steady State ◽  
Flat Plate ◽  
Transport Model ◽  
Solid Phase ◽  
Time Lag ◽  
Jet Impingement ◽  
The Other ◽  
Maximum Temperature ◽  
Sudden Increase ◽  
Heating And Cooling

The temperature in a material could exceed the maximum allowable during transients when the heat load is suddenly increased despite a corresponding increase in cooling. This is because there is a time lag in the response of the material. Unsteady RANS based on the shear-stress transport model with conjugate analysis were used to study the unsteady heating and cooling of a superalloy flat plate with a thickness of 1 mm. The flat plate was initially at steady-state conditions, heated on one side by a constant heat flux of 10 W/cm2 and cooled on the other side by impingement of air jets such that the maximum temperature in the plate was just below 900 °C, where 900 °C was taken to be the maximum allowable material temperature. Suddenly, the heating load was increased from 10 W/cm2 to 68 W/cm2 with a corresponding increase in the cooling such that the maximum temperature in the plate remains just below 900 °C when steady state is reached. Results obtained show that though the maximum temperatures at the two steady states are just below 900 °C, the highest temperature in the material can exceed 900 °C by up to 14 seconds during the transient from one steady state to the other. Thus, the minimum cooling flow based on steady-state conditions are inadequate during the transient process if the sudden heating and cooling occurred simultaneously. However, if the increase in cooling preceded the sudden increase in heating by a sufficient amount of time (i.e., pre-cooling), then over temperature was found to not occur during the transient. This paper presents results that show the unsteady flow and heat transfer in the fluid phase and the transients in the solid phase with and without pre-cooling.

scholarly journals Short Time Dilatometry Quench System Analyses

2019 ◽  
Author(s):  
Andrew Banka ◽  
Andrew Senita ◽  
Robert Goldstein ◽  
Tareq Eddir ◽  
Robert Cryderman
Keyword(s):  
Induction Heating ◽  
Gas Flow ◽  
Cooling System ◽  
Thermal Analyses ◽  
Cfd Modeling ◽  
Complex Flow ◽  
Heating Source ◽  
Heating And Cooling ◽  
Gas Cooling ◽  
Cfd Analyses

Abstract Dilatometry test systems are commonly used for characterizing the transformation behavior in steels using induction heating for the heating source and gas flow for the cooling source. In these systems, the steel test article is assumed to have a uniform temperature throughout the sample. The accuracy of this assumption depends on the design of the induction heating and gas cooling systems, as well as the time scales for heating and cooling. Previous papers by the authors have shown the variations in temperature that occur during heating and cooling for a TA Instruments DIL805 dilatometer (dilatometer). Investigations were carried out for development of an improved heating/cooling system for this dilatometer using electromagnetic and thermal analyses for the induction coil and CFD analyses for the high-pressure gas cooling system. Electromagnetic analyses showed that a novel cooling system could be incorporated, though higher power would be required to maintain the same heating rate. While the improved cooling system showed promise on an idealized basis, full CFD modeling shows that the system would not provide improved cooling due to complex flow dynamics.

CPV cells cooling system based on submerged jet impingement: CFD modeling and experimental validation

2014 ◽  
Author(s):  
Davide Montorfano ◽  
Antonio Gaetano ◽  
Maurizio C. Barbato ◽  
Gianluca Ambrosetti ◽  
Andrea Pedretti
Keyword(s):  
Experimental Validation ◽  
Cooling System ◽  
Jet Impingement ◽  
Cfd Modeling ◽  
Submerged Jet

Exergoeconomic analysis of renewable multi-generation system

2020 ◽  
pp. 99-111
Author(s):  
Vontas Alfenny Nahan ◽  
Audrius Bagdanavicius ◽  
Andrew McMullan
Keyword(s):  
Capital Investment ◽  
Combined Cycle ◽  
Asian Countries ◽  
Generation System ◽  
Integrated Gasification Combined Cycle ◽  
Heating And Cooling ◽  
Integrated Gasification ◽  
Exergoeconomic Analysis ◽  
Main Components ◽  
The Cost

In this study a new multi-generation system which generates power (electricity), thermal energy (heating and cooling) and ash for agricultural needs has been developed and analysed. The system consists of a Biomass Integrated Gasification Combined Cycle (BIGCC) and an absorption chiller system. The system generates about 3.4 MW electricity, 4.9 MW of heat, 88 kW of cooling and 90 kg/h of ash. The multi-generation system has been modelled using Cycle Tempo and EES. Energy, exergy and exergoeconomic analysis of this system had been conducted and exergy costs have been calculated. The exergoeconomic study shows that gasifier, combustor, and Heat Recovery Steam Generator are the main components where the total cost rates are the highest. Exergoeconomic variables such as relative cost difference (r) and exergoeconomic factor (f) have also been calculated. Exergoeconomic factor of evaporator, combustor and condenser are 1.3%, 0.7% and 0.9%, respectively, which is considered very low, indicates that the capital cost rates are much lower than the exergy destruction cost rates. It implies that the improvement of these components could be achieved by increasing the capital investment. The exergy cost of electricity produced in the gas turbine and steam turbine is 0.1050 £/kWh and 0.1627 £/kWh, respectively. The cost of ash is 0.0031 £/kg. In some Asian countries, such as Indonesia, ash could be used as fertilizer for agriculture. Heat exergy cost is 0.0619 £/kWh for gasifier and 0.3972 £/kWh for condenser in the BIGCC system. In the AC system, the exergy cost of the heat in the condenser and absorber is about 0.2956 £/kWh and 0.5636 £/kWh, respectively. The exergy cost of cooling in the AC system is 0.4706 £/kWh. This study shows that exergoeconomic analysis is powerful tool for assessing the costs of products.

Optimization of the time the chromatograph thermostats exit to a given temperature

2020 ◽  
pp. 40-45
Author(s):  
Nadezhda O. Vzduleva ◽  
Valery B. Gitlin
Keyword(s):  
Heating Rate ◽  
Entire Range ◽  
Gas Chromatograph ◽  
Heating And Cooling ◽  
Operating Temperatures ◽  
The Stability

The problems of ensuring the stability of the temperature of the chromatographic experiment carried out using a serial gas chromatograph LGH-3000 are considered. Limiting the permissible heating rate of the chromatograph thermostats does not allow a quick transition to the new conditions of the chromatographic experiment in accordance with the requirements of the technical conditions. The processes of heating and cooling the thermostat are analyzed. It is shown that the ratio of the duration of the interval equal to the sum of the durations of the heating and cooling intervals to the duration of the heating interval is inversely proportional to the temperature of the chromatographic experiment. Based on this situation, an empirical algorithm is proposed for heating the thermostat to a given temperature, which made it possible to reduce the time it takes to reach a given temperature in the entire range of operating temperatures.

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