Principles of Enhanced Heat Transfer

Webb, Ralph L.; Kim, Nae-Hyun

doi:10.1201/b12413

Cited by 213 publications

(194 citation statements)

References 0 publications

Supporting

Mentioning

189

Contrasting

Unclassified

Order By: Relevance

“…Besides the comparison of an augmented surface to a smooth surface, performed by e.g. Webb and Kim (Webb and Kim, 1994) and Bejan (Bejan, 1987), there are possibilities to compare between two augmented surfaces.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer enhancement with gas-to-gas micro heat exchangers

Gerken

Brandner

Dittmeyer

2016

Applied Thermal Engineering

View full text Add to dashboard Cite

A characterization of gas-to-gas micro heat exchangers has been performed in terms of pressure drop behavior and heat transfer performance. The gas-to-gas micro heat exchangers differ by partition wall material, partition wall thickness and flow arrangement. The pressure drop behavior has been analyzed due to the pressure losses in different sections of the gas-to-gas micro heat exchangers. Increased pressure losses in front of and behind the micro channels have been detected due to modified geometries in the inlet and outlet distribution chambers. The heat transfer performance has been determined in terms of thermal effectiveness. The comparison among different partition wall materials and partition wall thicknesses showed no significant criteria of the influence of thermal conductivity on the thermal effectiveness. An assessment due to an overall heat exchanger effectiveness has been performed to compare the gas-to-gas micro heat exchangers. For this purpose, the overall exergy loss has been calculated by combination of thermal effectiveness and pressure losses. A strong impact of the exergy loss due to pressure drop has been detected which influences the overall exergy loss of the gas-to-gas micro heat exchangers.

show abstract

Section: Introductionmentioning

confidence: 99%

Heat transfer enhancement with gas-to-gas micro heat exchangers

Gerken

Brandner

Dittmeyer

2016

Applied Thermal Engineering

View full text Add to dashboard Cite

show abstract

“…The only novelty was that enthalpy flow component of heatlines was renamed _ q. To mask this, Guo et al [13] made reference to six old books [14][15][16][17][18][19] that had absolutely nothing to do with visualizing the distinction (or collaboration) between thermal diffusion and enthalpy flow lines in convection.…”

Section: Synergymentioning

confidence: 99%

Heatlines (1983) versus synergy (1998)

Bejan

2015

International Journal of Heat and Mass Transfer

View full text Add to dashboard Cite

a b s t r a c tA picture is worth a thousand words. This article is about a picture known as ''heatlines'' since 1983, and ''synergy'' since 1998. Both concepts, heatlines and synergy, are about visualizing the physics of convection, which is the combination (superposition) of heat conduction lines and enthalpy flow lines over a material in motion. Heatlines and synergy are reviewed here comparatively. This comparison reveals that synergy is a remake of heatlines, and that synergy has no physical connection with heat transfer enhancement. At bottom, it has become a lot easier to take an existing idea change some key words and drawings and publish the old idea as new.

show abstract

“…When assuming the perfectly combustion it is possible according to [15] use the below approximated theoretical formula (5,6).…”

Section: Figure 2 Scheme Of the Combustion Chambermentioning

confidence: 99%

“…In studying numerical modeling of a combustion processes and spreading of fire we could meet with the classical heat transfer [2,4,5,6] and also with the transient turbulent flow models. There are several possible models based on the Navier-Stokes equations that is possible to use [7,8].…”

Section: Introductionmentioning

confidence: 99%

Testing fireproof materials in a combustion chamber

et al. 2017

View full text Add to dashboard Cite

Abstract. This article deals with a prototype concept, real experiment and numerical simulation of a combustion chamber, designed for testing fire resistance some new insulating composite materials. This concept of a device used for testing various materials, providing possibility of monitoring temperatures during controlled gas combustion. As a fuel for the combustion process propane butane mixture has been used and also several kinds of burners with various conditions of inlet air (forced, free) and fuel flows were tested. The tested samples were layered sandwich materials based on various materials or foams, used as fillers in fire shutters. The temperature distribution was measured by using thermocouples. A simulation of whole concept of experimental chamber has been carried out as the non-premixed combustion process in the commercial final volume sw Pyrosim. The result was to design chamber with a construction suitable, according to the international standards, achieve the required values (temperature in time). Model of the combustion based on a stoichiometric defined mixture of gas and the tested layered samples showed good conformity with experimental results -i.e. thermal distribution inside and heat release rate that has gone through the sample.

show abstract

Principles of Enhanced Heat Transfer

Cited by 213 publications

References 0 publications

Heat transfer enhancement with gas-to-gas micro heat exchangers

Heat transfer enhancement with gas-to-gas micro heat exchangers

Heatlines (1983) versus synergy (1998)

Testing fireproof materials in a combustion chamber

Contact Info

Product

Resources

About