 compress laminar flow heat transfer rotat isotherm disk compress laminar flow heat transfer rotat isotherm disk flow heat transfer rotat isotherm disk re-examin includ effect compress properti variat viscou dissip neglect compress problem correl incompress problem assum linear variat viscos thermal conduct temperatur inaccuraci previou incompress solut correct compress appear distort normal coordin normal veloc compon multipl factor heat-transfer coeffici nusselt number express skin-friction compon torqu requir rotat disk 