Author : พนิต ช้อยกิ่ง, สุริยา พันธ์โกศล, เก้ากัน สุดประเสริฐ, กรณ์กนก อายุสุข และคณิต กฤษณังกูร
Journal : Naresuan University Journal: Science and Technology (NUJST), 2017, Volume 25, Issue 2, Pages 91-101.
More Information : http://www.journal.nu.ac.th/NUJST/article/view/1780
Abtract
Speed of sound is great importance for fuel injection timing and combustion timing in the diesel engines. In this study correlation of speed of sound in fatty acid ethyl esters (FAEE) and ethyl-biodiesels are correlated to the Martin’s rule of free energy additivity for predicting speed of sound from their own equations. Data available in literatures are used to validate and support the proposed equations. The speed of sound in FAEE and ethyl-biodiesel can be easily predicted from its carbon number (), number of double bonds () at different temperatures (T). The average absolute deviation (AAD) in predicting of saturated and unsaturated FAEE and ethyl-biodiesel are 0.56 and 0.31%, respectively. In addition, speed of sound in ethyl-biodiesel can be predicted either from average carbon number of atoms () and number of double bonds average () of fatty acids or from the SN and IV with approximately the same accuracy. The speed of sound outside temperature between 293.15 and 343.15 K may be possibly predicted by this model but accuracy may be lower.