How to fetch posts from custom posts type with custom taxonomy

suppose custom taxonomy name is "dp-cat".
custom category name is "Industrial".
and custom post type "design-port".

<?php

$current_tab_cat="Industrial";

$args = array('post_type' => 'design-port', 'dp-cat' => $current_tab_cat);

$loop = new WP_Query( $args );

global $post; while ( $loop->have_posts() ) : $loop->the_post();

$post_id=$post->ID;

the_title();

endwhile;

?>
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