Is use of "linearly " in the following sentences correct grammatically and conceptually?
Takao et al.  experimentally investigated Wells turbines with linearly variable thickness blades.
My means regarding to "linearly" is the following figure:(pleas see the figure)
This is non-linearly:
the following sentences is OK?
They experimentally investigated the turbines with variable thickness blades. The improved turbines under this investigation are created by linearly growing blade thickness with radius.