Heat Transfer In Tube Bundles Research Articles

Crossflow Heat Transfer in Tube Bundles at Low Reynolds Numbers

Crossflow Heat Transfer in Tube Bundles at Low Reynolds Numbers

Experimental investigations of the effects of tube bundles on boiling heat transfer. (1st report Experimental results)

For tube bundle of flooded evaporators, boiling heat transfer coefficients are improved by upward streaming vapor bubbes. The authors tried to clarify the relation between boiling heat transfer characteristics of single tubes and those of tube bundles. In this report, boiling heat transfer characteristics of low-finned-tubes are investigated, using bundles of 4 horizontal tubes in a vertical row with side walls. Experimental results are summarized as follows: (1) when the clearance between tube and side wall is larger than 5 [mm], the effects of side walls on boiling heat transfer of tube bundles cannot be recognized; (2) bundle effects are affected both by the heat flux of the tube itself and by the total heat flux of the lower tubes; (3) the heat flux increase by upward streaming vapor bubbles has maximum value at wall superheat 5 [K] for 1590 [kW/m2] of total heat flux of the lower tubes.

On the Numerical Analysis Method of Flow and Heat Transfer in Condensers

In this paper, a numerical method for the analysis of flow and heat transfer in condensers is presented. This method is based on the modified FLIC Method using triangular mesh pattern of FEM and on the idea of anisotropic porous media modeling the flow resistance and heat transfer of tube bundles, and is suitable for analysis of the flow and heat transfer problems in condensers with tube bundles and baffle plates of any complicated configuration. This method was applied to two examples, a one-dimensional experimental condenser, and a two-dimensional experimental condenser. The calculated results were compared with the experimental results and good agreements were obtained.

Numerical Solution Method for Prediction of Heat Transfer in Tube Bundles of Large-Size Intermediate Heat Exchangers in FBR Plants

Click to increase image sizeClick to decrease image sizeKEYWORDS: flow maldistributionsodiumheat exchangersheat transferthermal stresstube bundlefluid flownumerical solutionsthermal diffusion

Numerical solution method for prediction of heat transfer in tube bundles of large-size intermediate heat exchangers in FBR plants.

Click to increase image sizeClick to decrease image sizeKEYWORDS: flow maldistributionsodiumheat exchangersheat transferthermal stresstube bundlefluid flownumerical solutionsthermal diffusion