Uhylvwd Flahqfldv H{dwdv h Qdwxudlv/ Yro1 9/ qJ 5/ Mxo2Gh} 5337 ... and/or free electrons. In the case of fluids ...... heat transfer coefficient, $z a vector describing the fluid velocity,. $ ..... [31] McIntosh G. and Sharratt B. S. The Phys. Teach.