  Bulk viscosity is the only viscous influence that can change the background
dynamics in a homogeneous and isotropic universe. In the present work, we
analyze the bulk viscous cosmological model with the bulk viscosity coefficient
of the form $\xi=\xi_0+\xi_1H+\xi_2\left(\frac{\dot{H}}{H}+H\right)$ where,
$\xi_0$, $\xi_1$ and $\xi_2$ are bulk viscous parameters, and $H$ is the Hubble
parameter. We investigate the impact of the bulk viscous parameter on dynamics
of the universe in the recently proposed Weyl type $f(Q, T)$ gravity, where $Q$
is the non-metricity, and $T$ is the trace of the matter energy-momentum
tensor. The exact solutions to the corresponding field equations are obtained
with the viscous fluid and the linear gravity model of the form $f(Q, T)=\alpha
Q+\frac{\beta}{6\kappa^2}T$, where $\alpha$ and $\beta$ are model parameters.
Further, we constrain the model parameters using the $57$ points Hubble dataset
and recently released 1048 points Pantheon sample, which shows our model is
good congeniality with observations. We study the possible scenarios and the
evolution of the universe through the deceleration parameter, the statefinder
diagnostics, the Om diagnostics. It is observed that the universe exhibits a
transition from a decelerated to an accelerated phase of the universe under
certain constraints of model parameters.
