Heat Transfer From the Wall of a Porous Solid Involving Gas Injection and Vaporization

1970 ◽  
Vol 92 (1) ◽  
pp. 153-158 ◽  
Author(s):  
W. J. Frea ◽  
J. H. Hamelink
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Energy Transfer ◽  
Heat Transport ◽  
Latent Heat ◽  
Atmospheric Pressure ◽  
Gas Injection ◽  
Porous Wall ◽  
Porous Solid ◽  
Graphite Cylinder

An experimental study was made of heat transfer with gas injection through a porous wall into a pool of liquid, including vaporization effects. Air bubbling from the surface of a graphite cylinder into water at atmospheric pressure was used. It was possible to determine limits on energy transfer due to convection and to latent heat transport. It was found that under some conditions it was possible to operate the system with the surface rejecting heat while at temperatures less than that of the bulk pool liquid.

Heat Transfer Characteristics of Nano Suspension Type Latent Heat Transport Heat Transfer Fluid in Straight Pipe

2020 ◽  
Vol 2020 (0) ◽  
pp. 0021
Author(s):  
Shin-ichi MORITA ◽  
Tomotaka NISHI ◽  
Takanobu YAMADA ◽  
Toshihiro HANIU ◽  
Kazunori TAKAI ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Transport ◽  
Latent Heat ◽  
Heat Transfer Fluid ◽  
Heat Transfer Characteristics ◽  
Straight Pipe ◽  
Transfer Characteristics

Experimental Investigation of a Packed-Bed Latent Heat Thermal Storage System With Encapsulated Phase Change Material

2014 ◽  
Author(s):  
Tanvir E. Alam ◽  
Jaspreet Dhau ◽  
D. Y. Goswami ◽  
M. M. Rahman ◽  
Elias Stefankos
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Latent Heat ◽  
Flow Rate ◽  
Storage System ◽  
Volumetric Flow Rate ◽  
Packed Bed ◽  
Heat Transfer Fluid ◽  
Encapsulated Phase Change Material ◽  
Change Material

An experimental study on a laboratory scale prototype packed-bed latent heat thermal energy storage (TES) system is presented. Spherical capsules of sodium nitrate melting point of 306°C were used as the PCM and air was used as the heat transfer fluid (HTF). The storage system was operated between 286°C to 326°C and the volumetric flow rate of the HTF was varied from 110 m3/hr to 151 m3/hr. Temperature distribution along the bed and inside the capsules was monitored continuously during charging and discharging of the system. The effect of mass flow rate of the HTF on the charging and discharging time and on the pressure drop across the bed was also evaluated.

Experimental Investigation to Boiling Heat Transfer on a Heated Surface with Multiple Impinging Jets

2013 ◽  
Vol 663 ◽  
pp. 477-482
Author(s):  
Bin Ni ◽  
Jie Wen ◽  
Jun Liao ◽  
Hong Wu Deng
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Heat Flux ◽  
Atmospheric Pressure ◽  
Boiling Heat Transfer ◽  
Heated Surface ◽  
Impinging Jets ◽  
Boiling Regime ◽  
Multiple Jets ◽  
Jet Velocity

On the condition of water multiple jet impingements, a steady-state experimental study had been conducted for boiling heat transfer in an atmospheric pressure. The jet velocity was 0.95~1.59m/s and the sub-cooling degrees of jet fluid were 30~83°C.The results revealed that increasing either jet velocity or sub-cooling degrees would promote the heat flux through heated surface, and the effect was more pronounced in partial boiling regime than fully-developed boiling regime. The heat transfer with multiple jets is enhanced due to disturbance of different impingements. With modification of the factor which related to flow distance of fluid on heated surface, correlation which is applicable to one single impinging jet boiling, can also be used to calculate critical heat flux(CHF) in boiling heat transfer with multiple impinging jets.

scholarly journals Experimental study of forced convection heat transport in porous media

2017 ◽  
Author(s):  
Nicola Pastore ◽  
Claudia Cherubini ◽  
Dimitra Rapti ◽  
Concetta I. Giasi
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Experimental Study ◽  
Porous Medium ◽  
Porous Media ◽  
Heat Transport ◽  
Forced Convection ◽  
Convection Heat Transfer ◽  
Convection Heat ◽  
Forced Convection Heat Transfer

Abstract. The knowledge of the dynamics of forced convection heat transfer in porous media is relevant in order to optimize the efficiency of geothermal installations in aquifers. In some applications groundwater is used directly as thermal fluid. The system uses one or several drilling holes to pump and deliver groundwater with a heat exchange system at surface (open loop). Other applications use vertical borehole heat exchangers without injection or extraction of groundwater (closed loop). In both systems the convection flow dynamics in porous media play an important role on the heat production. The present study is aimed at extending this thematic issue through heat transport experiments and their interpretation at laboratory scale. An experimental study to evaluate the dynamics of forced convection heat transfer in a thermally isolated column filled with porous medium has been carried out. The behavior of two porous media having different grain sizes and specific surfaces has been observed. The experimental data have been compared with an analytical solution for one dimensional heat transport for local non thermal equilibrium condition. The interpretation of the experimental data shows that, the heterogeneity of the porous medium affects heat transport dynamics causing a channeling effect which has consequences on thermal dispersion phenomena and heat transfer between fluid and solid phases limiting the capacity to store or dissipate heat in the porous medium.

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