Hutchins (2005) investigated the dynamic stability and rheology of foams containing polymers up to 400 °F and 2000 psiby
using acirculating loop foam rheometer.A power law modelwas
proposed to describe the effective viscosity of foams.Foam stability and bubble texture were affected by the additives,temperature, and pressure.The foams with fine and homogeneous bubble
texture were more viscous and stable than those with coarse and
heterogeneous texture. Bonilla and Shah (2000), Sani etal.(2001),
and Sudhakar (2002, 2003) utilized a similar circulating loop
rheometer to investigate the rheology of Guar foams and Xanthan
foams. Herschel–Bulkley (HB)model and power law model were
adopted to correlate the viscosity data.