الفهرس 
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Abstract
In this work both the effects of surface conditions and type of boiling fluid on the pool boiling heat transfer coefficient from upward aluminum alloy 6061 heating and surfaces are investigated.
For this purpose, a test apparatus has been designed and constructed to achieve heat transfer measurements from seven horizontal aluminum alloy 6061 plates.
The first four plates are teated mechanically using different grained emery papers, while the remaining three plates are treated chemically by HCI acid. Demineralized water and acetone are used as the boiling fluids.
Expreiments are carried out 0.7 bar for both demineralized water and acetone, which corresponds to boiling temperature 90ْ C and 46 ْC respectively.
A detailed analysis of the experimental results ensures that the influence of the different surface conditions achieved, Either mechanically by different grained emery papers or chemically by HCL acid, on of the roughness paraments transfer coefficient (h) can not be correlated by one of the roughness parameters used in lierature within the whole range of heat flux.
A three parametric distribution functins N ® for the size of the stable vapor bubble in active nucleation sites are obtained for the seven tested plates using the heat transfer measurments.
An attempt has been made to find the relationship between the distribution ffunctions constants and the surface roughness parameter (Rp) measured directly by a profilomerer.